CustomTransition: Minor fix

Change-Id: I1c815347e2650129044edcfdec2825f38d4c619c

Author: yaraki

CustomTransition/Application/src/main/java/com/example/android/customtransition/MainActivity.java

@@ -78,11 +78,7 @@ public boolean onOptionsItemSelected(MenuItem item) {
         if (item.getItemId() == R.id.menu_toggle_log) {
             mLogShown = !mLogShown;
             ViewAnimator output = findViewById(R.id.sample_output);
-            if (mLogShown) {
-                output.setDisplayedChild(1);
-            } else {
-                output.setDisplayedChild(0);
-            }
+            output.setDisplayedChild(mLogShown ? 1 : 0);
             invalidateOptionsMenu();
             return true;
         }