dshot beeper ignore list fix

[P-I-Engineer]

dshot beeper was implemented outside of the beeper ignore list.

it's been added in now along with a beeper off.

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[github-actions]

Branch Targeting Suggestion

You've targeted the master branch with this PR. Please consider if a version branch might be more appropriate:

• maintenance-9.x - If your change is backward-compatible and won't create compatibility issues between INAV firmware and Configurator 9.x versions. This will allow your PR to be included in the next 9.x release.

• maintenance-10.x - If your change introduces compatibility requirements between firmware and configurator that would break 9.x compatibility. This is for PRs which will be included in INAV 10.x

If master is the correct target for this change, no action is needed.

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This is an automated suggestion to help route contributions to the appropriate branch.

[sensei-hacker]

This may sound like a silly question, but has this been tested with it NOT set?
Often, we test that code does what we want it to do, but forget to test that it doesn't do what we don't want it to do. :). Ie doesn't stop the beeper from working when it's supposed to.

[P-I-Engineer]

yes:
tested with beeper list empty, the motor beeped and buzzer beeped on hw_failure.
then tested with "beeper -hw_failure" and neither motor or buzzer beeped.

i tested in steps on purpose.

[sensei-hacker]

Oops, the branch wasn't updated so any release, so this would never end up getting released. I'll cherry-pick it into 9.1.