smtp/mime: fix url extraction when no config is set

src/app-layer-smtp.c

@@ -337,7 +337,7 @@ static void SMTPConfigure(void) {
             if (unlikely(seq_node->name == NULL)) {
                 FatalError(SC_ERR_FATAL, "SCStrdup failure.");
             }
-            scheme->val = SCStrdup("http");
+            scheme->val = SCStrdup("http://");
             if (unlikely(scheme->val == NULL)) {
                 FatalError(SC_ERR_FATAL, "SCStrdup failure.");
             }