Namelist comparison for mizuRoute control files in tests shows Inequivalent lines that are only different in whitespace

The mizuRoute control files: CaseDocs/mizuRoute.control are text files in a non-standard format. The namelist comparison for testing shows them being different even for things that just different by whitespace.

For example the baseline comparison of ctsm5.4.033 against ctsm5.4.032 for the test "SMS_D_Ld5.5x5_amazon_rHDMA.I2000Clm60SpMizGs.derecho_intel.mizuroute-default" shows these kind of differences in TestStatus.log:

```
2026-04-16 09:03:58: NLCOMP
Comparison failed between '/glade/u/home/glemieux/scratch/ctsm-tests/tests_0416-090144de/SMS_D_Ld5.5x5_amazon_rHDMA.I2000Clm60SpMizGs.derecho_intel.mizuroute-default.GC
.0416-090144de_int/CaseDocs/mizuRoute.control' with '/glade/campaign/cgd/tss/ctsm_baselines/ctsm5.4.032/SMS_D_Ld5.5x5_amazon_rHDMA.I2000Clm60SpMizGs.derecho_intel.mizur
oute-default/CaseDocs/mizuRoute.control'
Inequivalent lines SMS_D_Ld5.5x5_amazon_rHDMA.I2000Clm60SpMizGs.derecho_intel.mizuroute-default.GC.0409-131750de_int
! name of simulation != SMS_D_Ld5.5x5_amazon_rHDMA.I2000Clm60SpMizGs.derecho_intel.mizuroute-defaul
t.GC.0416-090144de_int ! name of simulation
NORMALIZED: SMS_D_Ld5.5x5_amazon_rHDMA.I2000Clm60SpMizGs.derecho_intel.mizuroute-default.GC.0409-131750de_int
! name of simulation != SMS_D_Ld5.5x5_amazon_rHDMA.I2000Clm60SpMizGs.derecho_intel.mizuroute-default.GC.
0416-090144de_int ! name of simulation
Inequivalent lines 5
! option for routing schemes (only one-option allowed) 1->IRF, 2->KWT, 3-> KW, 4->MC, 5->DW != 5
!
option for routing schemes (only one-option allowed) 1->IRF, 2->KWT, 3-> KW, 4->MC, 5->DW
NORMALIZED: 5
! option for routing schemes (only one-option allowed) 1->IRF, 2->KWT, 3-> KW, 4->MC, 5->DW != 5
! optio
n for routing schemes (only one-option allowed) 1->IRF, 2->KWT, 3-> KW, 4->MC, 5->DW
```