COP2/Int: Propagate CLIP_FLAG writes to the VU0.clipflag variable for use in COP2

This value was being updated then COP2 running VCLIP would have the wrong original clip flag value to work from.

pcsx2/VU0.cpp

@@ -198,6 +198,8 @@ void CTC2() {
 			vu1Finish(true);
 			vu1ExecMicro(cpuRegs.GPR.r[_Rt_].US[0]);	// Execute VU1 Micro SubRoutine
 			break;
+		case REG_CLIP_FLAG:
+			VU0.clipflag = cpuRegs.GPR.r[_Rt_].UL[0];
 		default:
 			VU0.VI[_Fs_].UL = cpuRegs.GPR.r[_Rt_].UL[0];
 			break;