fix bad buffer. remove unnecessary async

Author: engelhartrueben

src/extensions/message-handlers/auto-optin/index.js

@@ -32,12 +32,13 @@ export const available = organization => {
     }
 }
 
-export const preMessageSave = async ({ messageToSave, organization }) => {
+export const preMessageSave = ({ messageToSave, organization }) => {
     if (messageToSave.is_from_contact) {
         const config = Buffer.from(
             getConfig("AUTO_OPTIN_REGEX_LIST_BASE64", organization) ||
-            DEFAULT_AUTO_OPTIN_REGEX_LIST_BASE64
-        );
+            DEFAULT_AUTO_OPTIN_REGEX_LIST_BASE64,
+            "base64"
+        ).toString();
         const regexList = JSON.parse(config || "[]");
         const matches = regexList.filter(matcher => {
             const re = new RegExp(matcher.regex); // Want case sensitivity, probably?