remove a tab from the yml file

Author: DLWoodruff

.github/workflows/test_pr_and_main.yml

@@ -557,6 +557,6 @@ jobs:
         run: |
           cd examples/loose_agnostic/AMPL
           bash farmer_example.bash
-	  # GAMS is not tested because I don't want to deal with the license
+          # GAMS is not tested because I don't want to deal with the license
           #cd ../GAMS
           #bash farmer_example.bash