Move manga screen filter sheet to toolbar

Closes #6927
This makes it more consistent with the library. Tapping the chapters heading still opens the sheet for convenience.

app/src/main/res/values-night/themes.xml

@@ -6,9 +6,6 @@
         <!-- Theme Colors -->
         <item name="colorSurface">@color/surface_amoled</item>
         <item name="android:colorBackground">@color/background_amoled</item>
-
-        <!-- Custom Attributes-->
-        <item name="colorFilterActive">@color/filter_dark</item>
     </style>
 
 </resources>