fix: Fix nullable boolean inputs

server/api/controllers/board-memberships/create.js

@@ -29,6 +29,7 @@ module.exports = {
     },
     canComment: {
       type: 'boolean',
+      allowNull: true,
     },
   },
 

server/api/controllers/board-memberships/update.js

@@ -17,6 +17,7 @@ module.exports = {
     },
     canComment: {
       type: 'boolean',
+      allowNull: true,
     },
   },