fix(sas): drop the duplicated abort in the target re-registration check

%mpe_loadfail raises the message through its own %mp_abort, so the extra
%mp_abort before %return printed it twice. The newer blocks in this file
(the post-edit-hook syscc check, for instance) use %mpe_loadfail + %return
only; this block now matches them.

sas/sasjs/macros/mpe_loader.sas

@@ -485,7 +485,6 @@ select count(*) into: target_chk
     ,reason_txt=%quote(&msg)
     ,dc_dttmtfmt=&dc_dttmtfmt.
   )
-  %mp_abort(msg=&msg,mac=mpe_loader.sas);
   %return;
 %end;