Update Policy transparency dialog layout

- Update icon
- Fix color didn't apply dark theme.

Bug: 188756125
Bug: 189167991
Test: manual
Change-Id: Ie975c8999efe352fc9485d936a065d33e5ca76b1
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index f992e45..aa251f6 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -3190,7 +3190,7 @@
         </activity>
 
         <activity android:name=".enterprise.ActionDisabledByAdminDialog"
-                android:theme="@style/Transparent"
+                  android:theme="@style/Theme.AlertDialog"
                 android:taskAffinity="com.android.settings.enterprise"
                 android:excludeFromRecents="true"
                 android:exported="true"