fix/balance RA map Athena

1. Reduced strategic victory timer from 10 to 3 minutes to increase
pressure on players.
2. Increased the size of the starting islands in order to give a player
more strategic options.

Removed *Options: OpenRA.MapOptions* as seen in
https://github.com/OpenRA/OpenRA/pull/3939. Checked all starting
positions in-Game.
Merge pull request #3946 from wuschel/bleed

fix/balance RA map Athena (koth)