Reset rndsettings

This PR fixes an issue when resetting the rendering settings, fixes typo in method name
and removes usage of deprecated methods

To test:
 * Make sure that the integration tests are green (```RenderingEngineTest```)
 * Open an image in insight, modify the rendering settings save
 * click on the reset button. The rendering settings will be reset. note that they have not been saved. This is the same behaviour as before

@will-moore will modify the web during his refactoring.

A breaking change with no deprecation. Ok with that? Also, we should probably start the list of API changes now.