Fix color of selected text in drawer menu for light theme

The MaterialDrawerTheme.Light.ActionBar makes the drawer icon in the top
left black for some reason. A work-around is to set the primary colour
back to green, so it will be used for Theme.AppCompat.Light and override
the selected text colour for the dark theme.

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

@@ -1,6 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
 
+    <color name="primary">#7bad45</color>
+
     <color name="icons">#ffffff</color>
     <color name="transparent">#00ffffff</color>
 

OpenKeychain/src/main/res/values/themes.xml

@@ -59,6 +59,8 @@
         <item name="colorHeaderText">#d0d0d0</item>
         <item name="colorTertiaryText">#808080</item>
 
+        <item name="material_drawer_selected_text">#268bd2</item>
+
         <!-- remove actionbar and title, we use toolbar! -->
         <item name="windowNoTitle">true</item>
         <item name="windowActionBar">false</item>