[ronie]

2020-09-01 functional change

when a user switches to a different skin through Settings > Interface > Skin,
it will now load the new skin from Startup.xml (instead of staying on the settings window).

this will help skins that depend on Startup.xml to set up their skin, like
- running a script to populate the main menu
- setting window properties


pull-request: https://github.com/xbmc/xbmc/pull/18319
Commit: https://github.com/xbmc/xbmc/commit/4fec...bbf450a46a