[mv3] Fix `header=` conversion in custom DNR rules
Related commit: https://github.com/gorhill/uBlock/commit/e871d6e673
R
Raymond Hill committed
cfe54fc900b85b94e6540ff8d3fb5ebe55d3d04f
Parent: 4236392
Related commit: https://github.com/gorhill/uBlock/commit/e871d6e673