Fix and clean up !1327 (JVET-Q0629: no 4x4 palette)

Detail

• Bugfix: Use correct size of chorma on the condition check of JVET-Q0629: Removal of 4x4 blocks in palette mode. The decoder will print error message without this fix.
• Cleanup: Remove the unnecessary condition check of JVET-Q0629.
• Sample setting to duplicate the error without this fix EncoderApp.exe -c ../../../../../cfg/encoder_intra_vtm.cfg -c ../../../../../../sequence/WebBrowsing_444.cfg -i ../../../../../../sequence/sc_web_browsing_1280x720_30_8bit_300_444_r1.yuv -f 1 -ip 1 -q 22 -fs 0 -b WebBrowsing_22.bin --PLT=1 --IBC=1 --HashME=1 --BDPCM=1 --PrintHexPSNR=1 --SEIDecodedPictureHash=1 > WebBrowsing_Qp22.txt
• Attached results without this fix WebBrowsing_Qp22_WithoutFix.txt and with this fix WebBrowsing_Qp22_WithFix.txt