Enhancement: Fix removing kernel options with values

Reason: The role had a bug, removing kernel options in form key=value didn't work if users provide only a key.

Result: Removing kernel options only by name now works

Issue Tracker Tickets (Jira or BZ if any): Fixes #123

1. 1. Summary by Sourcery

Fix the removal logic for kernel options specified as key=value and add test coverage to ensure these options can be removed by name

Bug Fixes:

• Update regex in mod_boot_args to correctly match and remove kernel options with values

Tests:

• Add and adjust tests to verify that options provided as key=value can be removed by key alone and to assert remaining settings correctly