Add Loiter to LED control on mode flight

[John-Henrique]

Adds Loiter as a flight mode, allowing control of the LEDs when this mode is activated.

[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]

Thanks for submitting this. Welcome to the team!

If you like the LEDs, you might also be interested in testing the new page layout, which should be more intuitive, especially for new users.
I figured that since wiring mode needs to be done first, it doesn't make sense to put it at the bottom. I arranged the steps in order.
iNavFlight/inav-configurator#2578

You may also be interested in testing this PR, which makes the LED strip configuration save much faster. No need to wait for 128 messages if you only have 8 LEDs.

iNavFlight/inav-configurator#2574