Keep parameters on restart

Because I have to manually restart the game with parameters (for my bots, debugging, ect), otherwise they are lost. It's getting repetitive, and I think this may be useful one day.
Update restartGG2.gml
Prevent -restart parameter duplicates
DRY rule

(No functional improvement)
Updated and tested
Merge pull request #216 from MrRatermat/patch-2

Keep parameters on restart