fix: updating revisionHackmdSynced

lib/routes/page.js

@@ -840,9 +840,9 @@ module.exports = function(crowi, app) {
     const revisionId = req.body.revision_id || null;
     const grant = req.body.grant || null;
     const grantUserGroupId = req.body.grantUserGroupId || null;
-    const isSlackEnabled = !!req.body.isSlackEnabled;           // cast to boolean
+    const isSlackEnabled = !!req.body.isSlackEnabled;                     // cast to boolean
     const slackChannels = req.body.slackChannels || null;
-    const isSyncRevisionToHackmd = !!req.body.slackChannels;    // cast to boolean
+    const isSyncRevisionToHackmd = !!req.body.isSyncRevisionToHackmd;     // cast to boolean
     const socketClientId = req.body.socketClientId || undefined;
 
     if (pageId === null || pageBody === null) {