Update plasma-branding-MicroOS to version 20230420 / rev 5 via SR 1080793
https://build.opensuse.org/request/show/1080793
by user RBrownSUSE + dimstar_suse
- Remove unneeded cleanup of desktop drop-in
- 20230420
- Correct location for Desktop drop-in config
- Clean up invalid desktop drop-in file
- 20230419