activated state of switches match textsecure color

fixes #3881

res/values/themes.xml

@@ -202,6 +202,7 @@
         <item name="actionBarPopupTheme">@style/ThemeOverlay.AppCompat.Dark</item>
         <item name="android:textColor">@color/text_color_dark_theme</item>
         <item name="android:textColorSecondary">@color/text_color_secondary_dark_theme</item>
+        <item name="colorControlActivated">@color/textsecure_primary_dark</item>
         <item name="android:windowBackground">@color/black</item>
         <item name="conversation_list_item_background_selected">@drawable/list_selected_holo_dark</item>
         <item name="conversation_list_item_background_unread">@drawable/conversation_list_item_unread_background_dark</item>