kcApp.cpp: In _setMlistValue() the item index is now decremented for Menu Buttons but not List widgets.

src/kc/kcApp.cpp

@@ -824,7 +824,7 @@ void kcApp::_setMlistValue( ctl_t* cp, unsigned instVarId, const cmDspValue_t* v
 
             // decr. to account for skipping title row 
             // (see the complementary incrementn in _ctl_cb())
-            if( idx > 0 )
+            if( idx > 0 && cp->u.mlst.mbtn!=NULL)
               --idx;
 
             if( cp->u.mlst.mbtn==NULL)