fix(color): New inputs disappear until restart.

[philmoz]

Fixes #4315

Adding a new input with a gap before it to the last input would add the new to the wrong slot in the 'expos' data array.
Restarting the radio would rebuild the 'expos' array correctly.

This PR fixes ensures new inputs are added at the right spot (and cleans up the source file formatting).

[pfeerick]

Another issue I realised that doesn't stem from the same bug, but is semi-related, is that if you say

1. start with a blank model (so only four inputs)
2. add input 10

then when you go back to the add menu, it will let you add 5,11-32. If you add 5, it'll then let you add 6, and so on, and so on.

2.9.1 doesn't exhibit this bug, so 2.10 only I think.

[philmoz]

I think there is a bigger problem with the PR - please don't add it to 2.9 just yet.

[pfeerick]

I actually had (and should have been paying more attention, as this introduced that odd behaviour on the 2.9 build also), but have rolled it back. For some reason, I thought the aforementioned behaviour was present in 2.10 prior to now 🤷

I blame the heatwave 😆 ... I'm in the severe area ...