Update src/runtime/runtime.c

Co-authored-by: Copilot <[email protected]>

Author: probonopd

src/runtime/runtime.c

@@ -1856,7 +1856,6 @@ int main(int argc, char* argv[]) {
         if (apprun_pid == 0) {
             /* Child process - close keepalive pipe before exec */
             close(keepalive_pipe[0]);
-            close(keepalive_pipe[1]);
 
             /* exec AppRun */
             execv(filename, real_argv);