[MaterialButtonToggleGroup] Removed getAccessibilityClassName() override since TalkBack doesn't recognize the class name, in favor of getting identified as a generic list container

PiperOrigin-RevId: 423814546

Author: dsn5ft

lib/java/com/google/android/material/button/MaterialButtonToggleGroup.java

@@ -293,12 +293,6 @@ protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
     super.onMeasure(widthMeasureSpec, heightMeasureSpec);
   }
 
-  @NonNull
-  @Override
-  public CharSequence getAccessibilityClassName() {
-    return MaterialButtonToggleGroup.class.getName();
-  }
-
   @Override
   public void onInitializeAccessibilityNodeInfo(@NonNull AccessibilityNodeInfo info) {
     super.onInitializeAccessibilityNodeInfo(info);