Fix the name of wss fields in the output file of FieldConvert module

Issue/feature addressed

The wall shear stress is a vector alligned in the wall-tangential direction. It x, y and z components are output from the wss module. The name of the wss components are incorrected interpreted in !1352 (merged) and are fixed here.

Proposed solution

Shear_s ---> Shear_x

Shear_n ---> Shear_y

Implementation

Tests

Notes

Checklist

• [-] Functions and classes, or changes to them, are documented.
• User guide/documentation is updated.
• Changelog is updated.
• [-] Suitable tests added for new functionality.
• Contributed code is correctly formatted. (See the contributing guidelines).
• [-] License added to any new files.
• [ x] No extraneous files have been added (e.g. compiler output or test data files).