status: disable and free fscache at the end of the status command

At the end of the status command, disable and free the fscache so that we
don't leak the memory and so that we can dump the fscache statistics.

Signed-off-by: Ben Peart <benpeart@microsoft.com>

builtin/commit.c

@@ -1616,6 +1616,7 @@ struct repository *repo UNUSED)
 	wt_status_print(&s);
 	wt_status_collect_free_buffers(&s);
 
+	enable_fscache(0);
 	return 0;
 }