Remove incorrect umask change

Not sure why this got in there, but it is incorrect as it results in
creating files with too liberal permissions.

unix/vncserver/vncsession.c

@@ -117,9 +117,6 @@ begin_daemon(void)
     if (devnull > 2)
         close(devnull);
 
-    /* Full control of access bits */
-    umask(0);
-
     /* A safe working directory */
     if (chdir("/") < 0) {
         perror("chdir");