Reverts "Add button semantics in list tile (flutter#151599)" (flutter#152425)

Reverts: flutter#151599
Initiated by: chingjun
Reason for reverting: broke an internal test.
Original PR Author: hangyujin

Reviewed By: {chunhtai}

This change reverts the following previous change:
fixes: flutter#111960

Author: auto-submit[bot]

packages/flutter/lib/src/material/list_tile.dart

@@ -910,7 +910,6 @@ class ListTile extends StatelessWidget {
       autofocus: autofocus,
       enableFeedback: enableFeedback ?? tileTheme.enableFeedback ?? true,
       child: Semantics(
-        button: onTap != null || onLongPress != null,
         selected: selected,
         enabled: enabled,
         child: Ink(

packages/flutter/test/material/checkbox_list_tile_test.dart

@@ -1184,7 +1184,6 @@ void main() {
     ));
 
     expect(tester.getSemantics(find.byType(CheckboxListTile)), matchesSemantics(
-      isButton: true,
       hasCheckedState: true,
       isChecked: true,
       hasEnabledState: true,

packages/flutter/test/material/expansion_tile_test.dart

@@ -727,7 +727,6 @@ void main() {
     expect(
       tester.getSemantics(find.byType(ListTile).first),
       matchesSemantics(
-        isButton: true,
         hasTapAction: true,
         hasFocusAction: true,
         hasEnabledState: true,
@@ -743,7 +742,6 @@ void main() {
     expect(
       tester.getSemantics(find.byType(ListTile).last),
       matchesSemantics(
-        isButton: true,
         hasTapAction: true,
         hasFocusAction: true,
         hasEnabledState: true,

packages/flutter/test/material/list_tile_test.dart

@@ -304,7 +304,6 @@ void main() {
             ),
             TestSemantics.rootChild(
               flags: <SemanticsFlag>[
-                SemanticsFlag.isButton,
                 SemanticsFlag.hasEnabledState,
                 SemanticsFlag.isEnabled,
                 SemanticsFlag.isFocusable,

packages/flutter/test/material/radio_list_tile_test.dart

@@ -405,7 +405,6 @@ void main() {
             TestSemantics(
               id: 1,
               flags: <SemanticsFlag>[
-                SemanticsFlag.isButton,
                 SemanticsFlag.hasCheckedState,
                 SemanticsFlag.hasEnabledState,
                 SemanticsFlag.isEnabled,
@@ -442,7 +441,6 @@ void main() {
             TestSemantics(
               id: 1,
               flags: <SemanticsFlag>[
-                SemanticsFlag.isButton,
                 SemanticsFlag.hasCheckedState,
                 SemanticsFlag.isChecked,
                 SemanticsFlag.hasEnabledState,

packages/flutter/test/material/reorderable_list_test.dart

@@ -744,7 +744,6 @@ void main() {
             return false;
           });
           expect(child, matchesSemantics(
-            isButton: true,
             hasToggledState: true,
             isToggled: true,
             isEnabled: true,

packages/flutter/test/material/switch_list_tile_test.dart

@@ -72,7 +72,6 @@ void main() {
           id: 1,
           rect: const Rect.fromLTWH(0.0, 0.0, 800.0, 56.0),
           flags: <SemanticsFlag>[
-            SemanticsFlag.isButton,
             SemanticsFlag.hasEnabledState,
             SemanticsFlag.hasToggledState,
             SemanticsFlag.isEnabled,
@@ -87,7 +86,6 @@ void main() {
           rect: const Rect.fromLTWH(0.0, 0.0, 800.0, 56.0),
           transform: Matrix4.translationValues(0.0, 56.0, 0.0),
           flags: <SemanticsFlag>[
-            SemanticsFlag.isButton,
             SemanticsFlag.hasCheckedState,
             SemanticsFlag.hasEnabledState,
             SemanticsFlag.isChecked,
@@ -102,7 +100,6 @@ void main() {
           rect: const Rect.fromLTWH(0.0, 0.0, 800.0, 56.0),
           transform: Matrix4.translationValues(0.0, 112.0, 0.0),
           flags: <SemanticsFlag>[
-            SemanticsFlag.isButton,
             SemanticsFlag.hasCheckedState,
             SemanticsFlag.hasEnabledState,
             SemanticsFlag.isEnabled,