<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="Theme.K9.Dark.Base" parent="Theme.AppCompat">
        <item name="android:navigationBarColor">#000000</item>
    </style>
</resources>

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="Theme.K9.Dark.Base" parent="Theme.AppCompat.NoActionBar">
        <item name="android:navigationBarColor">#000000</item>
    </style>
</resources>

Fix consistent crashes when using dark theme
Fix consistent crashes when using dark theme

Commit 212f36170 moved dark theme's parent to
Theme.AppCompat.NoActionBar but the theme file for v21 was not updated.
This caused IllegalStateException to be thrown when constructing
K9Activities when dark theme has been selected.

The fix corrects the parent value.
