Check if uploading to lookup server is enabled before verifying

Signed-off-by: Joas Schilling <coding@schilljs.com>

settings/BackgroundJobs/VerifyUserData.php

@@ -186,7 +186,9 @@ class VerifyUserData extends Job {
 	 * @return bool true if we could check the verification code, otherwise false
 	 */
 	protected function verifyViaLookupServer(array $argument, $dataType) {
-		if(empty($this->lookupServerUrl) || $this->config->getSystemValue('has_internet_connection', true) === false) {
+		if(empty($this->lookupServerUrl) ||
+			$this->config->getAppValue('files_sharing', 'lookupServerUploadEnabled', 'yes') !== 'yes' ||
+			$this->config->getSystemValue('has_internet_connection', true) === false) {
 			return false;
 		}