remove float cast

Author: tlancina

src/android/IonicKeyboard.java

@@ -18,7 +18,7 @@ public void initialize(CordovaInterface cordova, CordovaWebView webView) {
         //http://developer.android.com/guide/practices/screens_support.html
         DisplayMetrics dm = new DisplayMetrics();
         cordova.getActivity().getWindowManager().getDefaultDisplay().getMetrics(dm);
-        final float density = (float)(dm.density);
+        final float density = dm.density;
 
         final CordovaWebView appView = webView;