Weaken Parameter type for clearBut Methods

[jannisveerkamp]

clearBut() methods should only need an instance of AbstractTrayPreference instead the concrete implementation TrayPreference.

Since we are only weakening the type of the parameter it should not break anything.

This is needed in case you're using an alternative Implementation.

@passsy

[codecov-io]

Codecov Report

Merging #89 into master will not impact coverage.

@@           Coverage Diff            @@
##             master    #89    +/-   ##
========================================
  Coverage       100%   100%            
- Complexity        0    271   +271     
========================================
  Files            22     22            
  Lines           659    659            
  Branches         98     57    -41     
========================================
  Hits            659    659

Impacted Files	Coverage Δ	Complexity Δ
...rary/src/main/java/net/grandcentrix/tray/Tray.java	100% <ø> (ø)	8 <ø> (+8)	✅
...grandcentrix/tray/provider/TrayProviderHelper.java	100% <100%> (ø)	21 <ø> (+21)	✅

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