fixed graphical bugs caused by commit f77bbb8f and 1b4dc759

fixed graphical bugs caused by commit f77bbb8f and 1b4dc759

Each of these two commits exactly do the reverse of the other commit,
both still resulting in graphical bugs (that the corresponding other
commit fixes).

This change should fix both problems, resulting in (a) playfield not
flashing black when game started from level editor and (b) different
global borders when playing from level editor being correctly drawn.