Merge pull request initialxy#65 from jrunkel/ios-fix-density

ios: remove hardcoded density value and add correct param

src/ios/CDVThemeableBrowser.m

@@ -915,7 +915,7 @@ - (UIImage*) getImage:(NSString*) name altPath:(NSString*) altPath altDensity:(C
             altDensity = 1.0;
         }
         NSData* data = [NSData dataWithContentsOfFile:path];
-        result = [UIImage imageWithData:data scale:3.0];
+        result = [UIImage imageWithData:data scale:altDensity];
     }
 
     return result;