make toolbar menu use the proper day/night popup theme

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

src/main/res/layout/toolbar_standard.xml

@@ -42,7 +42,7 @@
             android:id="@id/toolbar"
             android:layout_width="match_parent"
             android:layout_height="?attr/actionBarSize"
-            app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
+            app:popupTheme="@style/Theme.AppCompat.DayNight.NoActionBar" />
 
         <ProgressBar
             android:id="@+id/progressBar"