WORLDGUARD-3153 - Reported by fhntv24

1. //pos1 -1000000000,0,-1000000000
2. //pos2 1000000000,0,1000000000
3. /size = 0 selection size
4. /rg claim with maximun of 40k region size
5. YAY , AGAIN INFINITE REGION SIZE

(Region size must be larger that int max size, so it would cause int overflow)