Fix limb drying rate test

[ShnitzelX2]

Summary

Bugfixes "fix limb drying rate and related test data"

Purpose of change

A deeper dive for #78014, fixing the drying_rate test case. In retrospect, it is astounding the test even works sometimes.

1. This test case, for drying a character off, did not take into account the current weather. Whether it's warm or freezing and foggy makes a big difference in the test's outcomes. I captured the weather in the last PR, where it was identified to indeed be the issue:

D:\a\Cataclysm-DDA\Cataclysm-DDA\tests\limb_test.cpp(187): FAILED:
  REQUIRE( base_dry == Approx( 450 ).margin( 125 ) )
with expansion:
  587 (0x24b) == Approx( 450.0 )
with messages:
  weather.weather_id.c_str() := "clear"
  units::to_fahrenheit( weather.temperature ) := 19.61243f  <--- 19 degrees F; colder = drying takes longer
  weather.weather_precise->humidity := 58.9053541728

I also isolated the same issues by running the following tests, in which drying rate nearly always failed:

acid_field_expiry_on_map
field_expiry
firebugs
fd_acid_falls_down
fire_spreading
drying_rate

2. The approximate "correct" values for the test were mathematically wrong, period. I don't know how the given numbers were calculated, not that it mattered because the weather wasn't standardized for the test.

Describe the solution

Respectively,

1. At beginning of test, set weather (temperature + humidity + CLEAR) to normal as defined by the drying algorithm
2. Readjust test values to be more accurate for normal weather

Describe alternatives you've considered

Testing

Ran the test a few times after fixing and got results almost identical to the test's expected values, then ran the full suite without any errors. If you see errors again, post them here.

Additional context