Ensure footer view colors are updated after inflation

Fixes: 269218509
Test: manual
      0: Have some notification present
      1: Set theme to light mode
      2: `adb shell am crash com.android.systemui`
      3: Unlock device
      4: expand the notification shade
      5: Turn off the screen
      6: Turn on the screen
      7: *Without unlocking*, expand the notification shade
      Observe: icon is the correct color
Change-Id: Ib1372afd22c323421f5f4b935bf549af95589aee

packages/SystemUI/src/com/android/systemui/statusbar/notification/row/FooterView.java

@@ -88,6 +88,7 @@ public class FooterView extends StackScrollerDecorView {
         mSeenNotifsFooterTextView = findViewById(R.id.unlock_prompt_footer);
         updateResources();
         updateText();
+        updateColors();
     }
 
     public void setFooterLabelTextAndIcon(@StringRes int text, @DrawableRes int icon) {