dns: initialize log flags as an unsigned long long

On 64 bit all 64 bits were being initialized, but on 32 bit
only 32 bits were as it was being initialized as a long.

Redmine issue:
https://redmine.openinfosecfoundation.org/issues/4206

src/output-json-dns.c

@@ -579,7 +579,7 @@ static DnsVersion JsonDnsParseVersion(ConfNode *conf)
 
 static void JsonDnsLogInitFilters(LogDnsFileCtx *dnslog_ctx, ConfNode *conf)
 {
-    dnslog_ctx->flags = ~0UL;
+    dnslog_ctx->flags = ~0ULL;
 
     if (conf) {
         if (dnslog_ctx->version == DNS_VERSION_1) {