HillslopeFromFile test failing

### Brief summary of bug

The Hillslope test that tests the "FromFile" options is failing at run-time.

### General bug information

**CTSM version you are using:** ctsm5.4.050-116-g5bc7a0d82 (what will be ctsm5.4.051) undoubtly was before this though

**Does this bug cause significantly incorrect results in the model's science?** No

**Configurations affected:** Hillslope tests with FromFile option for hillslope_pft_distribution_method and hillslope_soil_profile_method

### Details of bug

This test fails at runtime:

SMS_D_Ld3.f10_f10_mg37.I1850Clm60Bgc.derecho_intel.clm-HillslopeFromFile

### Important details of your setup / configuration so we can reproduce the bug

The user_nl_clm changes are:

``` fortran
use_hillslope = .true.
use_hillslope_routing = .true.
downscale_hillslope_meteorology = .false.
hillslope_head_gradient_method = 'Darcy'
hillslope_transmissivity_method = 'LayerSum'
hillslope_pft_distribution_method = 'PftLowlandUpland'
hillslope_soil_profile_method = 'Uniform'

use_ssre = .false.
hillslope_pft_distribution_method = 'FromFile'
hillslope_soil_profile_method = 'FromFile'
hillslope_file = '$DIN_LOC_ROOT/lnd/clm2/testdata/surfdata_10x15_hist_1850_78pfts_c240216.synth_hillslopes_241001.no_nan_fill.nc'
```

### Important output or errors that show the problem

cesm.log:
```
dec2394.hsn.de.hpc.ucar.edu 126: mosart decomp info proc = 126 begr = 255151 endr = 257175 numr = 2025
dec2394.hsn.de.hpc.ucar.edu 127: mosart decomp info proc = 127 begr = 257176 endr = 259200 numr = 2025
dec2394.hsn.de.hpc.ucar.edu 0: PIO2 pio_file.c retry NETCDF
dec2394.hsn.de.hpc.ucar.edu 1: PIO2 pio_file.c retry NETCDF
dec2394.hsn.de.hpc.ucar.edu 109: forrtl: error (65): floating invalid
dec2394.hsn.de.hpc.ucar.edu 109: Image PC Routine Line Source
dec2394.hsn.de.hpc.ucar.edu 109: libc.so.6 000015230A51A900 Unknown Unknown Unknown
dec2394.hsn.de.hpc.ucar.edu 109: cesm.exe 0000000001F65274 hillslopestreamou 993 HillslopeHydrologyMod.F90
dec2394.hsn.de.hpc.ucar.edu 109: cesm.exe 0000000001F85504 hydrologydrainage 151 HydrologyDrainageMod.F90
dec2394.hsn.de.hpc.ucar.edu 109: cesm.exe 0000000000920B9D clm_drv 1148 clm_driver.F90
```