Fix beta version in about page.
Fix beta version in about page.

Fixes #602.

chrisfried/DIM,chrisfried/DIM,delphiactual/DIM,delphiactual/DIM,48klocs/DIM,LouisFettet/DIM,delphiactual/DIM,DestinyItemManager/DIM,bhollis/DIM,DestinyItemManager/DIM,bhollis/DIM,chrisfried/DIM,chrisfried/DIM,48klocs/DIM,DestinyItemManager/DIM,bhollis/DIM,bhollis/DIM,48klocs/DIM,LouisFettet/DIM,DestinyItemManager/DIM,delphiactual/DIM