Core/Achievements: Fix PortalJockey

Current Status: Portal Jockey(10) is rewarded from 10nh and 25nh, Portal
Jockey(25) is rewarded from 10hc and 25hc.
Reason: Achievement-criteria 12971 is required for Portal Jockey(25), but
checks for map-difficulty 2=10hc.
On the other side achievment-criteria 12979 is required for Portal
Jockey(10), but checks for map-difficulty 1=25nh.