desktop: add "GIMP" in keywords to fix search with flatpak.
The only reason "gimp" can be used to search for the software (for instance in GNOME overview) is because it is the Exec (the short name is written neither in the Name nor Comment sections). When packaged by systems like flatpak, this key is changed to `flatpak run ...` and searching "gimp" does not even return the software! Adding a Keywords entry to our desktop file fixes this. Apart from "gimp", I take the opportunity to add other relevant keywords from our website which currently would not display GIMP as a result: graphic design illustration painting.
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