Change brightness dialog theme

Added new theme Theme.DeviceDefault.QuickSettings.Dialog and applied it
to the brightness dialog.

Fixes: 62010126
Test: visual

Change-Id: I3bc1116a227d5e62d8624c9a4911771152f3ced0
diff --git a/packages/SystemUI/AndroidManifest.xml b/packages/SystemUI/AndroidManifest.xml
index 79b02a5..c4e134b 100644
--- a/packages/SystemUI/AndroidManifest.xml
+++ b/packages/SystemUI/AndroidManifest.xml
@@ -531,7 +531,7 @@
         <activity
             android:name=".settings.BrightnessDialog"
             android:label="@string/quick_settings_brightness_dialog_title"
-            android:theme="@android:style/Theme.DeviceDefault.Light.Dialog"
+            android:theme="@*android:style/Theme.DeviceDefault.QuickSettings.Dialog"
             android:finishOnCloseSystemDialogs="true"
             android:launchMode="singleInstance"
             android:excludeFromRecents="true"