Kills seconds_per_tick from status effect tick, replaces it with seconds_between_ticks to clarify some things (#77219)

## About The Pull Request

https://github.com/tgstation/tgstation/pull/66573#discussion_r861157216

`status_effect/proc/tick(seconds_per_tick)` is wildly misleading and I
feel like I should address it

For a majority of status effects, they process on fast processing but do
not tick every fastprocessing tick

This means that using `seconds_per_tick` here is not giving you the
seconds between status effect ticks, it's giving you seconds between
processing ticks (`0.2`)

This is how it's misleading - If you have a tick interval of `1
SECONDS`, you'd think `seconds_per_tick` is, well, one. But it's
actually one-fifth. So all of your effects are now 80% weaker.

I have replaced the use of `seconds_per_tick` in tick with
`seconds_between_ticks`.

This number is, quite simply, the initial tick interval of the status
effect divided by ten.

An effect with the tick interval of `1 SECONDS` has a
`seconds_between_ticks` of 1.

As a consequence, some things which were inadvertently made weaker, such
as fire and some heretic things (at a glance), are now a little
stronger.

## Why It's Good For The Game

See above. Makes it more clear what you're doing when working with
effects.

## Changelog

🆑 Melbert
code: Updated some status effect tick code to be more clear of how long
is elapsing between ticks. Some effects that were inadvertently weakened
are now stronger as a result (fire and some heretic effects).
/🆑

code/modules/mob/living/basic/basic.dm

@@ -222,7 +222,7 @@
 /mob/living/basic/update_stamina()
 	set_varspeed(initial(speed) + (staminaloss * 0.06))
 
-/mob/living/basic/on_fire_stack(seconds_per_tick, times_fired, datum/status_effect/fire_handler/fire_stacks/fire_handler)
+/mob/living/basic/on_fire_stack(seconds_per_tick, datum/status_effect/fire_handler/fire_stacks/fire_handler)
 	adjust_bodytemperature((maximum_survivable_temperature + (fire_handler.stacks * 12)) * 0.5 * seconds_per_tick)
 
 /mob/living/basic/update_fire_overlay(stacks, on_fire, last_icon_state, suffix = "")