Simplify IInputMethodInvoker#updateEditorToolType() a bit

This is a mechanical refactoring CL that simplifies

  IInputMethodInvoker#updateEditorToolType(),

which was added recently [1], by making its return value void from
boolean, because no one checks its return value.

There should be no observable behavior change.

 [1]: I91ea9204ef62697b8942b0f350169382f18b3278
      e5f499176d

Bug: 234882948
Test: presubmit
Change-Id: Id9b14d8ced97b6a57f1cc5539f4f392aa70f9e51

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

@@ -221,14 +221,12 @@ final class IInputMethodInvoker {
     }
 
     @AnyThread
-    boolean updateEditorToolType(int toolType) {
+    void updateEditorToolType(@MotionEvent.ToolType int toolType) {
         try {
             mTarget.updateEditorToolType(toolType);
         } catch (RemoteException e) {
             logRemoteException(e);
-            return false;
         }
-        return true;
     }
 
     @AnyThread