Replace clearRect with fillRect
Replace clearRect with fillRect

clearRect always fills with transparent black.  When the context no
longer had an alpha channel, this was causing the background to turn
from white to black.  Oops!

google/codeworld,pranjaltale16/codeworld,nomeata/codeworld,venkat24/codeworld,three/codeworld,three/codeworld,parvmor/codeworld,stefan-j/codeworld,stefan-j/codeworld,parvmor/codeworld,pranjaltale16/codeworld,pranjaltale16/codeworld,three/codeworld,tgdavies/codeworld,nomeata/codeworld,tgdavies/codeworld,stefan-j/codeworld,google/codeworld,alphalambda/codeworld,venkat24/codeworld,google/codeworld,parvmor/codeworld,venkat24/codeworld,alphalambda/codeworld,nomeata/codeworld,alphalambda/codeworld,tgdavies/codeworld