CMEPS
                                
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                        Fix So_t for regional atm+docn configuration
Description of changes
This PR fixes So_t wiring in the configuration like atm+docn.
Specific notes
Contributors other than yourself, if any: N/A
CMEPS Issues Fixed (include github issue #): https://github.com/ESCOMP/CMEPS/issues/414
Are changes expected to change answers? (specify if bfb, different at roundoff, more substantial) No, since this configuration is not tested. The changes in the masking from ocn->atm direction might change the answer over land for mediator history file. More test will be done under CESM.
Any User Interface Changes (namelist or namelist defaults changes)?
Testing performed
Please describe the tests along with the target model and machine(s)
- CMCC, Zeus regional Adriatic configuration.
If possible, please also added hashes that were used in the testing
@mvertens @jedwards4b If you think that this is still issue just let me know and I could change the status of this PR. Otherwise we could close this.