Don't pretend that user-to-user file transfers are working (they don't)

So just always assume that no "user" directory has been configured. At least for now while I ponder whether this is a feature worth restoring and if so, how.

src/sbbs3/scfglib2.c

@@ -335,8 +335,10 @@ BOOL read_file_cfg(scfg_t* cfg, char* error, size_t maxerrlen)
 
 		if(!stricmp(cfg->dir[i]->sname,"SYSOP"))			/* Sysop upload directory */
 			cfg->sysop_dir=i;
+#if 0 // TODO: Remove or re-implement
 		else if(!stricmp(cfg->dir[i]->sname,"USER"))		/* User to User xfer dir */
 			cfg->user_dir=i;
+#endif
 		else if(!stricmp(cfg->dir[i]->sname,"UPLOADS"))  /* Upload directory */
 			cfg->upload_dir=i;
 		else if(!stricmp(cfg->dir[i]->sname,"OFFLINE"))	/* Offline files dir */