Remove combine-spws

When using -concatenate-frequency the use of -combine-spws is not necessary anymore.

workflows/linc_target/gsmcal.cwl

@@ -281,8 +281,6 @@ steps:
         source: concat/msout
       - id: verbose
         default: true
-      - id: combine-spws
-        default: true
       - id: concatenate-frequency
         default: true
       - id: strategy