Incorrect typescript definition for QUALITY_CHANGE_* events

Created by: davemevans

See https://github.com/Dash-Industry-Forum/dash.js/blob/development/index.d.ts#L259.

I'm no typescript expert but, when compared to https://github.com/Dash-Industry-Forum/dash.js/blob/development/src/streaming/MediaPlayerEvents.js#L135, it looks like the string values for QUALITY_CHANGE_RENDERED, and QUALITY_CHANGE_REQUESTED are the wrong way round?