Update atom.desktop.ini
Update atom.desktop.ini

Categories shouldn't include GNOME, as that's for GNOME core apps.
MimeType should include all default (i.e., with the default bundled
packages) supported file types for the editor.

PKRoma/atom,Mokolea/atom,brettle/atom,brettle/atom,atom/atom,Mokolea/atom,PKRoma/atom,atom/atom,brettle/atom,atom/atom,PKRoma/atom,Mokolea/atom