Fix generateAuthorizationCode not being awaited

Author: MaximilianGaedig

lib/handlers/authorize-handler.js

@@ -93,7 +93,7 @@ AuthorizeHandler.prototype.handle = async function(request, response) {
 
     const requestedScope = this.getScope(request);
     const validScope = await this.validateScope(user, client, requestedScope);
-    const authorizationCode = this.generateAuthorizationCode(client, user, validScope);
+    const authorizationCode = await this.generateAuthorizationCode(client, user, validScope);
 
     const ResponseType = this.getResponseType(request);
     const codeChallenge = this.getCodeChallenge(request);