Revert "Temporarily make binding controller no-op for visible bg users"

This reverts commit 2188e55b057335fae2a487681ee6973339de41f5 [1].

Reason for revert:
We are now ready to start launching IME for each active user in a
concurrent manner. The feature is now demoable.

 [1]: Ie8cea0888fab987d48410ae7638423f56d7029a2

Bug: 341558132
Bug: 344883373
Fix: 341558132
Test: presubmit
Flag: android.view.inputmethod.concurrent_input_methods
Change-Id: I3816401081a84c7765b2a0c150cc3a5544c95adb
diff --git a/services/core/java/com/android/server/inputmethod/InputMethodManagerService.java b/services/core/java/com/android/server/inputmethod/InputMethodManagerService.java
index aa20fcc..eebf818 100644
--- a/services/core/java/com/android/server/inputmethod/InputMethodManagerService.java
+++ b/services/core/java/com/android/server/inputmethod/InputMethodManagerService.java
@@ -2929,6 +2929,9 @@
         final var userData = getUserData(userId);
         userData.mSwitchingController.resetCircularListLocked(mContext, settings);
         userData.mHardwareKeyboardShortcutController.update(settings);
+
+        final var bindingController = getInputMethodBindingController(userId);
+        bindingController.setSelectedMethodId(id);
     }
 
     @GuardedBy("ImfLock.class")