Resolves a `TypeError: got an unexpected keyword argument 'layer_type'`. A recent change (PR #3311) started passing the `layer_type` argument when calling `get_pergroup_param()`. This specific implementation does not use this parameter, causing the error. This patch adds `layer_type=None` to the method signature to maintain API compatibility and ignore the unused argument. Signed-off-by: SlightwindSec <slightwindsec@gmail.com>