fix: App Config (app.toml) Parsing Fix

[davidterpay]

app.toml automatically fills in fields with defaults even if they are not set so our parsing logic has to take the defaults into account.

[codecov]

Codecov Report

Attention: Patch coverage is 64.51613% with 11 lines in your changes missing coverage. Please review.

Project coverage is 56.48%. Comparing base (ca2a9e1) to head (da2c996).
Report is 1 commits behind head on main.

Files	Patch %	Lines
oracle/config/app.go	64.51%	10 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #624      +/-   ##
==========================================
- Coverage   56.48%   56.48%   -0.01%     
==========================================
  Files         250      250              
  Lines       13045    13068      +23     
==========================================
+ Hits         7369     7381      +12     
- Misses       4968     4979      +11     
  Partials      708      708              

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