fixed always redrawing global border when redrawing playfield area

fixed always redrawing global border when redrawing playfield area

When in the level editor, the "special editor door" area was not redrawn
correctly when redrawing the global border, but was instead always
redrawn with the "normal" border (without special treatment for the
larger editor door area).

This workaround fixes redrawing the global border inside the level editor.