[enh] Add %F to Exec in the desktop file

See https://bugzilla.redhat.com/show_bug.cgi?id=1635276

A user has reported that Paraview does not appear in the "Open With" list when opening the context menu for a file on Fedora. This is fixed by appending "%F" to the Exec line in the desktop file.

It probably would be good to list applicable MimeTypes as well, though that may be a very long list :)

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