Fixes the microversion comparison in both enable and disable nova-compute service methods in NovaHelper. The previous implementation was incorrect and started to fail for microversion greather than 2.99. Closes-Bug: #2120586 Assisted-By: Cursor (claude-4-sonnet) Change-Id: I69da7f10cd5b42f7d4613d8947bca3e382815c3f Signed-off-by: Douglas Viroel <viroel@gmail.com>