Fix "Error writing /path/to/sbbs.ini" when using '-f' option.

Wasn't opening the sbbs.ini file for modify access.

As reported via DOVE-Net by Accession (PHARCYDE)

src/sbbs3/scfg/scfg.c

@@ -2467,7 +2467,7 @@ void bail(int code)
 
 		sbbs_get_ini_fname(cfg.filename, cfg.ctrl_dir);
 
-		fp = iniOpenFile(cfg.filename, /* for_modify? */false);
+		fp = iniOpenFile(cfg.filename, /* for_modify? */true);
 		if(fp == NULL)
 			uifc.msgf("Error opening %s", cfg.filename);
 		else {