Allow Tricordrazine to Heal Minor Accidental Exposures

[Timfa2112]

Description

As requested in Goob: https://discord.com/channels/1323488536501944350/1323488538750353442/1343047906114011167
this allows Tricordrazine to heal very minor amounts of radiation poisoning. The use case: I walked past a Borg with a micro-RTG and the medibot won't stop bugging me because it doesn't know it can't help.
With this change it can help, but it's really only viable for small amounts.
Ordinarily, in these small amounts of damage (10-12 tops), it was a hassle to make appropriate radiation medicine for; a lot of effort for only a tiny problem. This apparently caused annoyance, and this change will both make Tricordrazine a tiny bit more useful and lessen the aforementioned problem.

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Changelog

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• tweak: Tweaked Tricordrazine to heal MINOR amounts of radiation damage. This includes Medibots. If it's more than a teeny tiny amount, go to medical! This also alleviates the issue where the medibot keeps pestering you about the 0.1 rad damage because it thinks it can heal it, while the medicine it'll inject (before this change) didn't actually do anything.