tvplanit: Fix keyboard behavior of TVpContactGrid (issue #34641)

git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@6743 8e941d3f-bd1b-0410-a28a-d453659cc2b4

components/tvplanit/source/vpcontactgrid.pas

@@ -1639,6 +1639,7 @@ begin
       end;
     else
       inherited;
+      exit;
   end;
 
   Invalidate;