[Reportbug-maint] Bug#842018: reportbug: .desktop file launches shell application without setting Terminal=true

[林博仁]

I believe that the gtk support of reportbug should be separated in individual 
package(like reportbug-gtk) instead of listing it's dependency in Suggests:.
Also moving the desktop entry to that package so it won't confuse user that 
this is an intended-to-be GUI application.

林博仁 <Buo.Ren.Lin at gmail.com>