fix: Fix handling of the privateKeyFile and api-enabled options

[mcamou]

Description

This PR fixes # the handling of the privateKeyFile and api-enabled options.

privateKeyFile wasn't being correctly processed if the masaDir was changed

api-enabled should use the constant defined for that purpose instead of inlining the value

Notes for Reviewers

Signed commits

• Yes, I signed my commits.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.

Project coverage is 12.52%. Comparing base (eaa4303) to head (5199c9b).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/config/app.go	0.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #640      +/-   ##
==========================================
- Coverage   12.71%   12.52%   -0.19%     
==========================================
  Files          93       93              
  Lines        6766     6770       +4     
==========================================
- Hits          860      848      -12     
- Misses       5831     5847      +16     
  Partials       75       75              

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[mcamou]

@restevens402 Regarding the PageSize issue you found, that should be taken care of by always using WithConstantOptions, although if that happened to you it might be a Good Idea ™️ to rethink the ConstantOption handling a little bit so that it's impossible to NOT do it (and yet give a chance to change it if needed). Or am I perhaps misunderstanding what the issue was?

[mudler]

Looking good!