fix(derived): do not duplicate a shadowed column in the grid payload

cols1 already holds the physical column, so appending the derived row for the
same name would send it twice.  The derived row is now appended only when the
name is new; a shadowed column keeps the physical label and format, while its
value comes from the view.

sas/sasjs/services/editors/getdata.sas

@@ -544,10 +544,14 @@ select upcase(loadtype)
 %if &derived_nobs>0 %then %do;
   %mp_getcols(work.vw_derived, outds=derived_cols_all)
   proc sql;
+  /* a derived variable may shadow a physical column - that column is already
+    in cols1, and adding it again would duplicate it in the grid.  The
+    physical row keeps its label and format; the value comes from the view. */
   create table work.derived_cols as
     select a.*
     from work.derived_cols_all a
-    where a.NAME in (select NAME from work.derived_vars);
+    where a.NAME in (select NAME from work.derived_vars)
+      and a.NAME not in (select NAME from work.cols1);
   quit;
   data work.cols1;
     set work.cols1 work.derived_cols;