Fixes for warnings in RecordGroups.py - unused vars

See comments on commit:
https://github.com/wrye-bash/wrye-bash/commit/8c645041851e107e0efd21196812874c4f41f25b
Fixes for warnings in RecordGroups.py - Unexpected argument

See comments on commit:
https://github.com/wrye-bash/wrye-bash/commit/8c645041851e107e0efd21196812874c4f41f25b
Removed unused args from getActiveRecords() + lambda x was shadowing x