Fix extra dim turns on failed in setting search bar

Root cause: Don't call displayPreference before setChecked called.
Solution: Don't show quick settings tooltips if preference is not ready.

Bug: 237850687
Test: make RunSettingsRoboTests ROBOTEST_FILTER=AccessibilityQuickSettingsPrimarySwitchPreferenceControllerTest
Change-Id: I52425190cce4ab3cf31be025a743bf8b212fa1f9

src/com/android/settings/accessibility/AccessibilityQuickSettingsPrimarySwitchPreferenceController.java

@@ -102,6 +102,11 @@ public abstract class AccessibilityQuickSettingsPrimarySwitchPreferenceControlle
     }
 
     private void showQuickSettingsTooltipIfNeeded() {
+        if (mPreference == null) {
+            // Returns if no preference found by slice highlight menu.
+            return;
+        }
+
         final ComponentName tileComponentName = getTileComponentName();
         if (tileComponentName == null) {
             // Returns if no tile service assigned.