MINOR: channel/applets: Stop to test CF_WRITE_ERROR flag if CF_SHUTW is enough

In applets, we stop processing when a write error (CF_WRITE_ERROR) or a shutdown
for writes (CF_SHUTW) is detected. However, any write error leads to an
immediate shutdown for writes. Thus, it is enough to only test if CF_SHUTW is
set.
diff --git a/src/ssl_crtlist.c b/src/ssl_crtlist.c
index 9027d0e..e76fb9a 100644
--- a/src/ssl_crtlist.c
+++ b/src/ssl_crtlist.c
@@ -1098,7 +1098,7 @@
 	/* for each bind_conf which use the crt-list, a new ckch_inst must be
 	 * created.
 	 */
-	if (unlikely(sc_ic(sc)->flags & (CF_WRITE_ERROR|CF_SHUTW)))
+	if (unlikely(sc_ic(sc)->flags & CF_SHUTW))
 		goto end;
 
 	switch (ctx->state) {