Fix styles for CodeWorld blocks, which were broken by folders patch.
Fix styles for CodeWorld blocks, which were broken by folders patch.

three/codeworld,tgdavies/codeworld,parvmor/codeworld,alphalambda/codeworld,venkat24/codeworld,pranjaltale16/codeworld,google/codeworld,alphalambda/codeworld,tgdavies/codeworld,parvmor/codeworld,venkat24/codeworld,pranjaltale16/codeworld,tgdavies/codeworld,three/codeworld,alphalambda/codeworld,three/codeworld,google/codeworld,venkat24/codeworld,pranjaltale16/codeworld,google/codeworld,parvmor/codeworld