redhat: configs: fix CONFIG_WERROR replace in build_configs
$$ is the process ID (PID) of the script itself, and current script leads to issues where WERROR doesn't get randomly set, when pid happens to be too low (e.g. in CKI container)
Drop the line range, let sed run over entire file.
Signed-off-by: Jan Stancek jstancek@redhat.com