Drop unused PGchoicemacros.pl from load macros list

Author: gajennings

OpenProblemLibrary/Rochester/setIntegrals0Theory/sc5_2_30.pg

@@ -20,7 +20,7 @@
 
 DOCUMENT();    # This should be the first executable line in the problem.
 
-loadMacros('PGstandard.pl', 'PGML.pl', 'PGchoicemacros.pl', 'PGcourse.pl');
+loadMacros('PGstandard.pl', 'PGML.pl', 'PGcourse.pl');
 
 $showPartialCorrectAnswers = 1;