Remove duplicate branches in request of plugins

The check for whether the name contains "ipv6" is not necessary for
the plugins "dnshome" and "ipv64", as the code path for both branches is the
same.
Furthermore the check is rather confusing in the context of the
provider named "ipv64.net", as "ipv6" is also contained in the
provider name itself.

plugins/dnshome.c

@@ -73,16 +73,6 @@ static ddns_system_t plugin_v6 = {
 
 static int request(ddns_t *ctx, ddns_info_t *info, ddns_alias_t *alias)
 {
-	if (strstr(info->system->name, "ipv6"))
-		return snprintf(ctx->request_buf, ctx->request_buflen,
-			info->system->server_req,
-			info->server_url,
-			alias->name,
-			alias->address,
-			info->server_name.name,
-			info->creds.encoded_password,
-			info->user_agent);
-
 	return snprintf(ctx->request_buf, ctx->request_buflen,
 			info->system->server_req,
 			info->server_url,

plugins/ipv64.c

@@ -74,16 +74,6 @@ static ddns_system_t plugin_v6 = {
 
 static int request(ddns_t *ctx, ddns_info_t *info, ddns_alias_t *alias)
 {
-	if (strstr(info->system->name, "ipv6"))
-		return snprintf(ctx->request_buf, ctx->request_buflen,
-			info->system->server_req,
-			info->server_url,
-			alias->name,
-			alias->address,
-			info->server_name.name,
-			info->creds.encoded_password,
-			info->user_agent);
-
 	return snprintf(ctx->request_buf, ctx->request_buflen,
 			info->system->server_req,
 			info->server_url,