Orientation.lock() not works as intended

[onurkose-uma]

I've tested it only on Xcode emulator.
When the initial device orientation is "landscape-secondary", and if you fire the orientation.lock('landscape'), it does not lock to the landscape-secondary, screen flips and locks to landscape-primary.
If I change the emulator device orientation to any of the landscape modes later, the app conforms new landscape orientation.

[breautek]

I believe this is caused by the plugin's usage of [[UIDevice currentDevice] setValue:value forKey:@"orientation"]; which is actually a readonly property.

https://github.com/apache/cordova-plugin-screen-orientation/pull/102/files corrects this, so I believe it will be fixed by that PR.

[breautek]

Closing as duplicate of #80