cleanup: Define GObject accessors in camelCase

gjs is smart enough to match a propertyName getter/setter to the
corresponding property-name GObject property, so use that and get
rid of the eslint camelcase rule exceptions.

!175
4 jobs for !175 with gobject-cleanup in 9 minutes and 9 seconds
latest detached
Status Name Job ID Coverage
  Pre Review
passed check_commit_log #1136266

00:00:33

passed check-merge-request #1136267

00:00:34

 
  Review
passed eslint #1136268

00:00:59

 
  Build
passed flatpak #1136269
flatpak

00:07:36