Remove game name from categories list in slide-out mod info

[VortexFeedback]

Vortex Version: 0.15.7 In the Category dropdown in the mod slide-out information, the game name prefixes every category. Since I'm only able to view and change aspects of the one game at a time that I have selected, I find it unnecessry to have the name prefix every category in the list. I think it just needlessly clutters the list.

Reported by: capella6707

[TanninOne]

It's not really my decision, that's how the categories are named on Nexus Mods. In some games, for example Skyrim there is another "top-level" category (Enderal in that case) so I can't just drop that.