Make page margin to truly black for tablets. (#834)

app/src/main/res/drawable/tab_page_margin_black.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+    <solid android:color="@color/tab_page_margin_black" />
+</shape>

app/src/main/res/values/colors.xml

@@ -49,6 +49,7 @@
     <color name="text_color_primary_black">#FFFFFF</color>
     <color name="toolbar_background_black">#111111</color>
     <color name="dialog_background_black">#111111</color>
+    <color name="tab_page_margin_black">#000000</color>
     <!--Light Theme Colors-->
     <color name="color_primary_light">#dfdfdf</color>
     <color name="color_primary_dark_light">#8f8f8f</color>

app/src/main/res/values/styles.xml

@@ -172,6 +172,7 @@
         <item name="material_drawer_selected">@color/color_primary_black</item>
         <item name="material_drawer_selected_text">@color/text_color_primary_black</item>
         <item name="material_drawer_header_selection_text">@color/text_color_primary_black</item>
+        <item name="tab_page_margin_drawable">@drawable/tab_page_margin_black</item>
     </style>
     <style name="TuskyBlackTheme" parent="TuskyBlackThemeBase"/>