Fixes some icons that show bad markings when run on greater than 4 color
Workbenches.  Doesn't fix them all, but fixes a common problem.  

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                  242     624  38.8% -lh5- 8df3 Aug 20  1992 FixIcon.info
[generic]                 4891    8116  60.3% -lh5- 64fe Aug 20  1992 FixIcon/fixicon
[generic]                 1798    4707  38.2% -lh5- fd99 Aug 20  1992 FixIcon/fixicon.c
[generic]                 1723    3511  49.1% -lh5- ea9d Aug 20  1992 FixIcon/FixIcon.doc
[generic]                  649     738  87.9% -lh5- 74b6 Aug 20  1992 FixIcon/FixIcon.doc.info
[generic]                  123     148  83.1% -lh5- 6e61 Aug 20  1992 FixIcon/ReadMe.fnf
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         6 files    9426   17844  52.8%            Aug 20  1992