Fix inverted scrollwheel direction in keybinds

[zjeffer]

Describe your PR, what does it fix/add?

hl.bind("mouse_down", function ()
    hl.notification.create({text = "Mouse down", timeout = 1000})
end)
hl.bind("mouse_up", function ()
    hl.notification.create({text = "Mouse up", timeout = 1000})
end)

The above binds are an easy way to show the issue: when scrolling down, you'll see the "Mouse up" notification and vice versa. The if statement needs to be inverted.

Checking with wev, scrolling down yields:

[        15:      wl_pointer] axis: time: 14953488; axis: 0 (vertical), value: 15.000000

so a positive delta.

Is there anything you want to mention? (unchecked code, possible bugs, found problems, breaking compatibility, etc.)

This has been broken for 4 years (from its initial implementation in #265) so this might break some people's configs.

Is it ready for merging, or does it need work?

Ready. I didn't test it though but this seems pretty trivial.

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[vaxerski]

one of the moments of all time

[wabarTM]

Probably worth mentioning in breaking changes tracker since this will break literally every config

[vaxerski]

well no it will fix every cofig that used mosue_ to bind anything, I doubt many do tbh

[rakibdev]

it broke everything. lost my job, family