bitbake-layers: fix wildcard support in remove-layer
The recent refactoring caused use of wildcards to trigger a traceback
because the old variable name was being used.
Fixes [YOCTO #7367].
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>