fix(tabs): align tab title and icons to flex-start

Closes #14606

Author: mhartington

core/src/components/tab-button/tab-button.scss

@@ -36,7 +36,7 @@ ion-tab-button a {
 
   flex-direction: column;
   align-items: center;
-  justify-content: space-between;
+  justify-content: flex-start;
 
   width: 100%;
   height: 100%;