Unregister mShowWeatherObserver when KeyguardClockSwitchController is detached

Bug: 295143740
Test: Manually checked codepath with secondary display
Change-Id: I8807d1d58b58f1e5c990c21cef6a810e8b13c1db

packages/SystemUI/src/com/android/keyguard/KeyguardClockSwitchController.java

@@ -292,6 +292,7 @@ public class KeyguardClockSwitchController extends ViewController<KeyguardClockS
         setClock(null);
 
         mSecureSettings.unregisterContentObserver(mDoubleLineClockObserver);
+        mSecureSettings.unregisterContentObserver(mShowWeatherObserver);
 
         mKeyguardUnlockAnimationController.removeKeyguardUnlockAnimationListener(
                 mKeyguardUnlockAnimationListener);