Refactor: Update PermissionedDomainDelete to use keylet for sle access

[tequdev]

High Level Overview of Change

Refactor to explicitly use keylet::permissionedDomain in PermissionedDomainDelete processing.

Context of Change

1. Refactor to explicitly use keylet::permissionedDomain in PermissionedDomainDelete processing.
2. Fix to retrieve the Owner from the pDomain's Owner field instead of the Account field of the transaction. (This is a non-breaking change as these are checked to be the same value in preclaim().)

Type of Change

• [x] Refactor (non-breaking change that only restructures code)

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 78.6%. Comparing base (adbeb94) to head (5b25a5b).

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #6063   +/-   ##
=======================================
  Coverage     78.6%   78.6%           
=======================================
  Files          818     818           
  Lines        68989   68990    +1     
  Branches      8249    8236   -13     
=======================================
+ Hits         54203   54217   +14     
+ Misses       14786   14773   -13     

Files with missing lines	Coverage Δ
...c/xrpld/app/tx/detail/PermissionedDomainDelete.cpp	100.0% <100.0%> (ø)

... and 5 files with indirect coverage changes

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