Cpu: fix InterruptMask not being reset to 1 on RTI from an IRQ
Cpu: fix InterruptMask not being reset to 1 on RTI from an IRQ

We need to set InterruptMask to 1 _before_ pushing CC to the stack so that on RTI, when CC is popped, it still contains 1 (and not 0). Fixes Bedlam not working on start new game following a game over.

amaiorano/vectrexy,amaiorano/vectrexy,amaiorano/vectrexy