GUI: Add option to configure cpus=4 on MacPro3,1/Xserve2,1

If booting Sonoma or older, can toggle off the workaround

opencore_legacy_patcher/constants.py

@@ -234,6 +234,7 @@ class Constants:
         self.disable_connectdrivers: bool = False  # Disable ConnectDrivers (hibernation)
         self.set_vmm_cpuid:          bool = False  # Set VMM bit inside CPUID
         self.disable_mediaanalysisd: bool = False  # Set mediaanalysisd to spawn
+        self.force_quad_thread:      bool = False #  Force quad thread mode (cpus=4)
         self.set_alc_usage:          bool = True  #  Set AppleALC usage
         self.allow_3rd_party_drives: bool = True  #  Allow ThridPartyDrives quirk
         self.allow_nvme_fixing:      bool = True  #  Allow NVMe Kernel Space Patches