Hit reactions - Improve fall down setting description

[johnb432]

When merged this pull request will:

• Title.
• Changes so that all negative values are considered to turn off this mechanic (instead of just -1).

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[PabstMirror]

Possible source of confusion is if someone tries to set to 0

this doesn't look negative but is actually -0.0272051

but this more of a cba problem, tbh I'm not sure why it doesn't show -0.0

[johnb432]

Possible source of confusion is if someone tries to set to 0 this doesn't look negative but is actually -0.0272051

but this more of a cba problem, tbh I'm not sure why it doesn't show -0.0

Tbh I'm not really happy with the slider either, having -1 be the disabling value and ]-1, 0[ unused is poor design imo.
Ideally, imo, 0 would mean turned off - but I don't really want to change the slider range, as it could invalidate people's existing settings.