Fix custom theme not applying to main screen correctly

We were using the SplashScreen incorrectly. While it isn't consistently
documented, I managed to find a small note on
https://developer.android.com/reference/kotlin/androidx/core/splashscreen/SplashScreen#usage-of-the-core-splashscreen-library:
which states that installSplashScreen has to be called BEFORE onCreate.
Doing this fixing some theming bugs and allows deleting a hacky and
buggy workaround.

app/src/main/java/protect/card_locker/CatimaAppCompatActivity.java

@@ -19,10 +19,7 @@ public class CatimaAppCompatActivity extends AppCompatActivity {
     @Override
     protected void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        // XXX splash screen activity has to do this after installing splash screen before view inflate
-        if (!this.getClass().getSimpleName().equals(MainActivity.class.getSimpleName())) {
-            Utils.patchColors(this);
-        }
+        Utils.patchColors(this);
     }
 
     @Override