Update get record change route

[Aravindh-Raju]

Fixes #1367.

Changes in this pull request:

• Removed the unnecessary segment to avoid any confusion as it's not used anywhere. Change the route a bit to match the other recordsetchange routes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.00%. Comparing base (372e7db) to head (ddd31fa).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1368   +/-   ##
=======================================
  Coverage   92.00%   92.00%           
=======================================
  Files         177      177           
  Lines        7947     7947           
  Branches      257      238   -19     
=======================================
  Hits         7312     7312           
  Misses        635      635           

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[nspadaccino]

Looks good, tested API locally

[nspadaccino]

The clients that use this route will have to be updated as well:
https://github.com/vinyldns/vinyldns-python/blob/master/src/vinyldns/client.py#L602
https://github.com/vinyldns/go-vinyldns/blob/main/vinyldns/recordsets.go#L248
https://github.com/vinyldns/vinyldns-java/blob/master/src/main/java/io/vinyldns/java/model/record/set/GetRecordSetChangeRequest.java#L19
https://github.com/vinyldns/terraform-provider-vinyldns/blob/master/vinyldns/resource_record_set.go#L393
https://github.com/vinyldns/vinyldns-js/blob/master/src/urls.js#L62
https://github.com/vinyldns/vinyldns-cli/blob/main/src/record_sets.go#L54