Fix: Show consistent healing quality

[inogenous]

Summary

Bugfixes "Show consistent healing quality"

Purpose of change

Fixes an issue where healing qualities shown when applying a bandage was different than the applied quality. Fixes #75736 .

Describe the solution

This is a continuation of the nice investigation that was done in #75857 .

The problem before was:

• For example, applying an adhesive bandage with "wound care" proficiency should give bandaging intensity 2, as returned from get_bandaged_level - this is correct.
• The bandaged effect as defined in effects.json specifies int_dur_factor=6h, so the intensity of this effect should be defined by setting its duration as multiples of int_dur_factor.
• When calculating the duration for the created effect, the code previously added 0.5f to the desired intensity, likely to prevent it from getting 0. <- This was one part of the previous problem.
• In effect::set_duration, the intensity is calculated from how many multiples of int_dur_factor that the desired duration is. That calulation added 1 to the desired intensity, likely to also prevent it from being 0. <- This was the second problem before.
• In effect, instead of applying intensity 2 for an adhesive bandage, the code previously applied intensity 3.5 .

With this commit, we instead use std::max(1, intensity) to prevent intensity from being 0. This commit also adds a debugmsg if the calculation of intensity based on the duration would start to differ from the expected values some time in the future.

Describe alternatives you've considered

Testing

• Applied adhesive bandage. Now shows the same bandage quality when choosing body part as the applied quality. ✓
• Applied bandage. Now shows the same bandage quality when choosing body part as the applied quality. ✓
• Applied antiseptic. Now shows the same disinfection quality when choosing body part as the applied quality. ✓
• Debug-spawned some flaming eyes. Had a staring contest. Threw up. Effect "touched mind" and "badly touched mind" is still applied as expected (to verify that other effects still work). ✓

Additional context