Android Editor: Fix expand button black bar issue

platform/android/java/editor/src/main/res/values/themes.xml

@@ -1,7 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
 	<style name="GodotEditorTheme" parent="@android:style/Theme.DeviceDefault.NoActionBar.Fullscreen">
-		<item name ="android:windowDrawsSystemBarBackgrounds">false</item>
+		<item name="android:statusBarColor">@android:color/transparent</item>
+		<item name ="android:navigationBarColor">@android:color/transparent</item>
 	</style>
 
 	<style name="GodotEditorSplashScreenTheme" parent="Theme.SplashScreen.IconBackground">