[mv3] Fix regression when editing custom cosmetic `#...` filter
Regression from: https://github.com/gorhill/uBlock/commit/46852ebd6f
R
Raymond Hill committed
27dbdb202eb701599fbbb11c51f6b3e43971630f
Parent: afbb85c
Regression from: https://github.com/gorhill/uBlock/commit/46852ebd6f