Don't cache encoded pref values during tests.

[phulin]

This should reverse the performance penalty with tests.

[codecov]

Codecov Report

Merging #1288 (bba03ab) into main (9a91981) will increase coverage by 0.30%.
The diff coverage is 90.90%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1288      +/-   ##
============================================
+ Coverage     32.34%   32.64%   +0.30%     
- Complexity    16061    16221     +160     
============================================
  Files          1043     1043              
  Lines        162635   162639       +4     
  Branches      35303    35303              
============================================
+ Hits          52602    53101     +499     
+ Misses       100822   100227     -595     
- Partials       9211     9311     +100     

Impacted Files	Coverage Δ
.../sourceforge/kolmafia/preferences/Preferences.java	84.89% <90.90%> (+0.13%)	⬆️
.../sourceforge/kolmafia/request/StandardRequest.java	78.37% <0.00%> (-2.71%)	⬇️
...sourceforge/kolmafia/textui/langserver/Script.java	80.85% <0.00%> (ø)
...eforge/kolmafia/swingui/panel/GearChangePanel.java	58.87% <0.00%> (+0.13%)	⬆️
src/net/sourceforge/kolmafia/KoLmafiaCLI.java	69.86% <0.00%> (+0.15%)	⬆️
src/net/sourceforge/kolmafia/StaticEntity.java	22.06% <0.00%> (+0.27%)	⬆️
...et/sourceforge/kolmafia/textui/RuntimeLibrary.java	36.02% <0.00%> (+0.30%)	⬆️
src/net/sourceforge/kolmafia/RequestLogger.java	28.76% <0.00%> (+0.41%)	⬆️
...sourceforge/kolmafia/persistence/TCRSDatabase.java	54.81% <0.00%> (+0.42%)	⬆️
...net/sourceforge/kolmafia/textui/DataFileCache.java	43.39% <0.00%> (+0.94%)	⬆️
... and 15 more

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