Revert "Fix IME insets animation applies again when restartInput called"

This reverts commit 0e766c11b0.

Reason for revert: Breaking presubmit

Bug: 153516672
Change-Id: I894b5d5ecff97c124b5e2bf7c7be28f23ee10367

services/core/java/com/android/server/inputmethod/InputMethodManagerService.java

@@ -3106,14 +3106,10 @@ public class InputMethodManagerService extends IInputMethodManager.Stub
                     MSG_SHOW_SOFT_INPUT, getImeShowFlags(), reason, mCurMethod, resultReceiver,
                     showInputToken));
             mInputShown = true;
-
             if (mHaveConnection && !mVisibleBound) {
                 bindCurrentInputMethodServiceLocked(
                         mCurIntent, mVisibleConnection, IME_VISIBLE_BIND_FLAGS);
                 mVisibleBound = true;
-            } else {
-                // Clear the show request after the input shown.
-                mShowRequested = false;
             }
             res = true;
         } else if (mHaveConnection && SystemClock.uptimeMillis()