Remove superfluous code, push change to default sender ID

[SecondeJK]

Change of default SenderID for Verify (legacy).

Description

UK Based carrier BT no longer accepts "verify" as a sender ID, as it is now a reserved keyword.

Motivation and Context

Bug fix.

How Has This Been Tested?

All tests pass

Example Output or Screenshots (if appropriate):

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [ ] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[codecov-commenter]

Codecov Report

Merging #453 (8d84d5d) into main (915a62f) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #453   +/-   ##
=========================================
  Coverage     78.94%   78.94%           
  Complexity     2331     2331           
=========================================
  Files           218      218           
  Lines          6264     6264           
=========================================
  Hits           4945     4945           
  Misses         1319     1319           

Files	Coverage Δ
src/Verify/Request.php	64.63% <ø> (ø)

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