Fix type error in noshare.c.

Its boolean parameters were typed 'int', a hangover from before the
int-to-bool migration last year. It's not used in the current state of
the code base, so nobody noticed until now.

noshare.c

@@ -15,7 +15,7 @@
 int platform_ssh_share(const char *name, Conf *conf,
                        Plug *downplug, Plug *upplug, Socket **sock,
                        char **logtext, char **ds_err, char **us_err,
-                       int can_upstream, int can_downstream)
+                       bool can_upstream, bool can_downstream)
 {
     return SHARE_NONE;
 }