Wrap callback object for enabled in tonumber func

[snepderg]

Proximity voice uses tobool( new ) in the callback, which leads to some interesting behaviour when trying to use incrementvar.

For example: incrementvar proximity_voice_enabled 0 1 1 will return 0.00 instead of 0, which is considered truthy.

To remedy this, I have wrapped the new in a tonumber() so it will handle 0.00 as 0.

[wrefgtzweve]

this will error if an invalid number eg "1a" is set as convar i think.
Check if the return from tobool exists

[NullLikesNothing]

this will error if an invalid number eg "1a" is set as convar i think. Check if the return from tobool exists

tobool will return false for nil

[snepderg]

Thank you for the feedback @NullLikesNothing , I appreciate it.

I have applied tonumber() to both proximity_voice_enabled and proximity_voice_transmit_only.