* JVET-O0070: Prediction refinement with optical flow for affine mode (PROF)

Add PROF support in encoder_lowdelay_P_vtm.cfg

cfg/encoder_lowdelay_P_vtm.cfg

@@ -130,6 +130,7 @@ LMCSEnable                   : 1      # LMCS: 0: disable, 1:enable
 LMCSSignalType               : 0      # Input signal type: 0:SDR, 1:HDR-PQ, 2:HDR-HLG
 LMCSUpdateCtrl               : 2      # LMCS model update control: 0:RA, 1:AI, 2:LDB/LDP
 MIP                          : 1
+PROF                         : 1
 
 # Fast tools
 PBIntraFast                  : 1