BUG/MEDIUM: comp: DEFAULT_MAXZLIBMEM was expressed in bytes and not megabytes

The value is stored in bytes but was not multiplied. It would only affect
packagers.
diff --git a/src/haproxy.c b/src/haproxy.c
index b5f9f39..b62d261 100644
--- a/src/haproxy.c
+++ b/src/haproxy.c
@@ -121,7 +121,7 @@
 	.req_count = 0,
 	.logsrvs = LIST_HEAD_INIT(global.logsrvs),
 #ifdef DEFAULT_MAXZLIBMEM
-	.maxzlibmem = DEFAULT_MAXZLIBMEM,
+	.maxzlibmem = DEFAULT_MAXZLIBMEM * 1024U * 1024U,
 #else
 	.maxzlibmem = 0,
 #endif