core: Fix the one place where we called a JS function and didn't check for jobs to run as a result. Fixes getting stuck in the intro as a non-admin.

src/task.c

@@ -550,6 +550,7 @@ static JSValue _task_invokeExport_internal(tf_taskstub_t* from, tf_task_t* to, e
 		}
 
 		result = JS_Call(to->_context, function, this_val, length - 1, argument_array);
+		tf_task_check_jobs(to);
 		tf_trace_end(to->_trace);
 
 		JS_FreeValue(to->_context, this_val);