remove this redundant FPP directive (#508)

# CABLE

Thank you for submitting a pull request to the CABLE Project.

## Description
remove  this redundant FPP directive. 

Fixes #super quick one liner

## Type of change

Please delete options that are not relevant.

- [x] Bug fix
- [ ] New or updated documentation

## Checklist

- [ ] The new content is accessible and located in the appropriate
section.
- [ ] I have checked that links are valid and point to the intended
content.
- [x] I have checked my code/text and corrected any misspellings

Please add a reviewer when ready for review.


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📚 Documentation preview 📚:
https://cable--508.org.readthedocs.build/en/508/

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src/coupled/esm16/cable_surface_types.F90

@@ -1,4 +1,3 @@
-!#define UM_CBL YES
 !******************************************************************************
 ! This source code is part of the Community Atmosphere Biosphere Land Exchange
 ! (CABLE) model. This work is licensed under the CSIRO Open Source Software