Fix EdgeExistenceAPI path

[msgui]

Purpose of the PR

Path name should match class name

Main Changes

Verifying these changes

• Trivial rework / code cleanup without any test coverage. (No Need)
• Already covered by existing tests, such as (please modify tests here).
• Need tests and can be verified as follows:
  • xxx

Does this PR potentially affect the following parts?

• Nope
• Dependencies (add/update license info)
• Modify configurations
• The public API
• Other affects (typed here)

Documentation Status

• Doc - TODO
• Doc - Done
• Doc - No Need

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (47aa8be) 66.31% compared to head (c7d7c93) 65.82%.

❗ Current head c7d7c93 differs from pull request most recent head 644e15e. Consider uploading reports for the commit 644e15e to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2379      +/-   ##
============================================
- Coverage     66.31%   65.82%   -0.49%     
+ Complexity      830      826       -4     
============================================
  Files           510      509       -1     
  Lines         42187    42139      -48     
  Branches       5840     5836       -4     
============================================
- Hits          27977    27740     -237     
- Misses        11445    11637     +192     
+ Partials       2765     2762       -3     

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[javeme]

prefer to rename EdgeExistence to EdgeExist