Fix wrong boolean handling

[jawira]

Hello, some boolean values weren't handled properly.

• Target
  • hidden attribute
• ModifiedSelector
  • update attribute
  • delayupdate attribute
  • seldirs attribute

[codecov]

Codecov Report

Merging #1680 (956972d) into main (d4b692c) will not change coverage.
The diff coverage is 50.00%.

@@            Coverage Diff            @@
##               main    #1680   +/-   ##
=========================================
  Coverage     58.34%   58.34%           
+ Complexity     6962     6961    -1     
=========================================
  Files           355      355           
  Lines         16611    16611           
=========================================
  Hits           9692     9692           
  Misses         6919     6919           

Impacted Files	Coverage Δ
src/Phing/Parser/TargetHandler.php	83.16% <0.00%> (ø)
src/Phing/Type/Selector/ModifiedSelector.php	76.87% <66.66%> (ø)

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