Fix missing comma that prevented --libdata from working

It doesn't seem to be much used, considering it's broken since revision 0af2349e where the feature was first introduced, and it hasn't been reported.

main.py

@@ -414,7 +414,7 @@ def main(argv):
             ('optimizer-options=', 'help', 'version', 'output=', 'header',
             'timestamp', 'python-exceptions', 'prettify', 'bom', 'emap',
             'preproc=', 'precmd=', 'prearg=', 'prenodef', 'preshow',
-            'avid=', 'avname=', 'assetid=', 'shortname=', 'builtins='
+            'avid=', 'avname=', 'assetid=', 'shortname=', 'builtins=',
             'libdata=', 'postarg=', 'preproc-show-cmdline'))
     except getopt.GetoptError as e:
         Usage(argv[0])

unit_tests/coverage.suite/lslparse-3.run

@@ -1 +1 @@
-main.py -y -b unit_tests/builtins-coverage-1.txt -L unit_tests/fndata-coverage-3.txt -O -dcr -
+main.py --python-exceptions --builtins unit_tests/builtins-coverage-1.txt --libdata unit_tests/fndata-coverage-3.txt --optimizer-options -dcr -