Replace total soil water with liquid in two FATES boundary conditions

[samsrabin]

Description of changes

Replaces total soil water with liquid in two FATES boundary conditions.

Specific notes

Contributors other than yourself, if any:

• None

CTSM issues resolved or otherwise addressed, if any:

• Resolves FATES liquid water boundary conditions sometimes include ice #4197.

If answers are expected to change, describe (delete this line otherwise): Yes: Basically all FATES runs with soil ice present.

Any user interface changes (namelist or namelist defaults changes)? No

Testing planned or performed, if any:

• aux_clm suite
• fates suite

Requirements before merge:

• I have followed the CTSM contribution guidelines.

• The code in this PR branch builds with no errors.
• The code in this PR branch runs with no errors. Briefly describe tested configuration(s):
• This either (a) does not change answers, (b) it only changes answers at roundoff level, or (c) I have performed a scientific evaluation of the answer changes. Which?:

• I have reviewed relevant parts of the CLM documentation Tech Note or User's Guide to determine if anything needs to be changed or added. If it does, describe:
• This PR either (a) does not create a need to update the documentation or (b) includes required documentation updates (see guidelines for contributing documentation). Which?: (a)