Issuer should not have a trailing slash

This causes opaque mapping failures

Author: brianhlin

osgtest/tests/test_190_condorce.py

@@ -42,7 +42,7 @@ def test_02_scitoken_mapping(self):
                         'HTCondor version does not support SciToken submission')
 
         condorce_version = core.PackageVersion('htcondor-ce')
-        scitoken_mapping = f'SCITOKENS "https://demo.scitokens.org/" {core.options.username}\n'
+        scitoken_mapping = f'SCITOKENS "https://demo.scitokens.org" {core.options.username}\n'
 
         # Write the mapfile to the admin mapfile directory
         # https://github.com/htcondor/htcondor-ce/pull/425