Fix iPad detection in user agent

Author: curtisliu

amplitude.js

@@ -2075,10 +2075,6 @@ module.exports = localStorage;
                 regex: "(?:PPC|Intel) (Mac OS X)",
                 os_replacement: "Mac",
                 manufacturer: "Apple"
-            }, {
-                regex: "(CPU OS|iPhone OS) (\\d+)_(\\d+)(?:_(\\d+))?",
-                os_replacement: "iPhone",
-                manufacturer: "Apple"
             }, {
                 regex: "(iPhone|iPod)",
                 os_replacement: "iPhone",