bugfix splash screen is shown when retracting keyboard in Mission editor

AndroidManifest.xml

@@ -44,6 +44,7 @@
         <activity
             android:name="cs.si.satatt.MissionActivity"
             android:label="@string/mission_editor"
+        	android:theme="@style/nonSplashScreenTheme"
              >
         </activity>
     </application>

res/values/styles.xml

@@ -21,6 +21,9 @@
     <style name="splashScreenTheme" parent="@style/AppTheme">
     	<item name="android:windowBackground">@drawable/loading</item>
 	</style>
+	<style name="nonSplashScreenTheme" parent="@style/AppTheme">
+    	<item name="android:windowBackground">@color/black</item>
+	</style>
 	
 	
     <style name="MooSpinnerItem" parent="android:Widget.TextView.SpinnerItem">