ctsm5.4.0xx: Update namelist defaults: paramfile, rh_hgh, defo_fire_precip_thresh_bet, initial conditions

[slevis-lmwg]

Description of changes

Copied from this post:

• New default paramfile for clm6
  paramfile = '/glade/work/linnia/CLM6-PPE/ctsm6_cal/paramfiles/ctsm60_params.c260204.nc'
• New defaults for CAM7_CLM6 land tuning mode

defo_fire_precip_thresh_bet = 1.4d00
rh_hgh = 80.0d00

• @wwieder will have new initial conditions for ne30 grids soon
• The initial conditions update also reminds me of two other pending issues: Post 5.4 remove use_init_interp=".true." from cases that don't need it #3751 Post 5.4: Change init_interp_fill_missing_urban_with_HD to FALSE for non-IHist cases #3363

Specific notes

Contributors other than yourself, if any:
@wwieder

CTSM Issues Fixed (include github issue #):
Fixes #3725

Are answers expected to change (and if so in what way)?
Yes, due to new namelist defaults

Does this create a need to change or add documentation? Did you do so?
Likely

Testing performed, if any:
I confirmed that I got the correct defaults by submitting (without building and running) two tests:

SMS_D.f10_f10_mg37.I2000Clm60BgcCrop.derecho_gnu.clm-crop
SMS.ne30pg3_t232.I2000Clm60BgcCrop.derecho_intel.clm-clm60cam7LndTuningMode

[slevis-lmwg]

@wwieder the lnd_tuning_mode changes should make sense, but I need to explain line 468:
In our namelist_defaults I found two settings for defo_fire_precip_thresh_bet for fire_method="li2024crujra", one in line 468 (value 1.8) and another in line 338 (value 3.0). I kept the latter value (3.0) but in this location (line 468).

I don't know if the presence of two values should worry us. I confirmed again that the model was using 3.0, so I'm staying with this value as we discussed.