make local platform definition more honest

Author: wxtim

.github/workflows/test.yml

@@ -93,7 +93,7 @@ jobs:
 
           cat >> "$CONF_PATH/global.cylc" <<__HERE__
           [platforms]
-            [[_local_background_indep_tcp]]
+            [[_local_background*]]
               hosts = localhost
               install target = localhost
               ssh command = ssh -oBatchMode=yes -oConnectTimeout=8 -oStrictHostKeyChecking=no