Fix no audit if Field->never_persist = true

[abbadon1334]

Discovered today in dev, using atk4/login and enable audit on Model User it saves password2 ( confirmation password), disclosing every password in clear text in audit backlog.

[codecov]

Codecov Report

Merging #30 into develop will increase coverage by 0.27%.
The diff coverage is 100.00%.

@@              Coverage Diff              @@
##             develop      #30      +/-   ##
=============================================
+ Coverage      62.00%   62.27%   +0.27%     
- Complexity       112      115       +3     
=============================================
  Files              5        5              
  Lines            279      281       +2     
=============================================
+ Hits             173      175       +2     
  Misses           106      106              

Impacted Files	Coverage Δ	Complexity Δ
src/Controller.php	88.81% <100.00%> (+0.14%)	74.00 <0.00> (+3.00)

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[DarkSide666]

Looks good, but please add the same for never_save and read_only properties.
These also can't be saved, so it's probably no use to store them in audit.