Fix typo in capsule_setup helper (#17657)

Signed-off-by: Gaurav Talreja <[email protected]>
(cherry picked from commit ab40a81)

robottelo/hosts.py

@@ -1640,7 +1640,7 @@ def capsule_setup(self, sat_host=None, capsule_cert_opts=None, **installer_kwarg
         """Prepare the host and run the capsule installer"""
         self._satellite = sat_host or Satellite()
 
-        if settings.robottelo.rhelsource == "ga":
+        if settings.robottelo.rhel_source == "ga":
             # Register capsule host to CDN and enable repos
             result = self.register_contenthost(
                 org=None,