InputService: init scaling from SharedPreferences

When we are restarted by the OS after a crash, setScaling() is not called, so
set scaling from last known setting instead of leaving it at 0.

Closes #113

app/src/main/java/net/christianbeier/droidvnc_ng/InputService.java

@@ -27,6 +27,8 @@
 import android.view.ViewConfiguration;
 import android.graphics.Path;
 
+import androidx.preference.PreferenceManager;
+
 public class InputService extends AccessibilityService {
 
 	/**
@@ -79,6 +81,7 @@ public void onServiceConnected()
 		super.onServiceConnected();
 		instance = this;
 		mMainHandler = new Handler(instance.getMainLooper());
+		mScaling = PreferenceManager.getDefaultSharedPreferences(this).getFloat(Constants.PREFS_KEY_SETTINGS_SCALING, new Defaults(this).getScaling());
 		Log.i(TAG, "onServiceConnected");
 	}