Update clm6_0 paramfile with Fang's fire changes.

* needleleaf_deciduous_boreal_tree rswf_min: 0.15 to 0.35
* needleleaf_deciduous_boreal_tree rswf_max: 0.55 to 0.7
* fd_pft (fire duration): Increase from 1 to 5 days
* fsr_pft (fire spread rate): Divide by 5

"The parameters rswf_max and rswf_min (thresholds for root-zone soil moisture) were adjusted to achieve more reasonable simulations of burned area fraction for needleleaf_deciduous_boreal_tree. The value of fd_pft (fire duration) was changed from 1 to 5 days, which aligns better with FireAtlas data for non-peat and non-deforestation fires outside croplands. To maintain the burned area unchanged, fsr_pft (fire spread rate) for most PFTs was divided by 5. fsr_pft is not used for prognostic crops, so its value for those PFTs was set to the fill value."

Author: samsrabin

bld/namelist_files/namelist_defaults_ctsm.xml

@@ -549,7 +549,7 @@ attributes from the config_cache.xml file (with keys converted to upper-case).
 <!-- The default filenames are given relative to the root directory
      for the CLM2 data in the CESM distribution -->
 <!-- Plant function types (relative to {csmdata}) -->
-<paramfile phys="clm6_0" >lnd/clm2/paramdata/ctsm5.3.041.Nfix_params.v13.c250221_upplim250.nc</paramfile>
+<paramfile phys="clm6_0" >lnd/clm2/paramdata/clm60_params.ctsm6_li2024.c250822.nc</paramfile>
 <paramfile phys="clm5_0" >lnd/clm2/paramdata/clm50_params.c250311.nc</paramfile>
 <paramfile phys="clm4_5" >lnd/clm2/paramdata/clm45_params.c250311.nc</paramfile>