execute_get_cell -> execute_cell

wrongly rename execute_cell leading to broken execute_all_cell

IPython/frontend/html/notebook/static/js/notebook.js

@@ -1014,7 +1014,7 b' var IPython = (function (IPython) {'
         var ncells = this.ncells();
         for (var i=0; i<ncells; i++) {
             this.select(i);
-            this.execute_get_selected_cell({add_new:false});
+            this.execute_selected_cell({add_new:false});
         };
         this.scroll_to_bottom();
     };