[TESTS] INI config testing for booleans raised errors
[TESTS] INI config testing for booleans raised errors

- On non-string values, a warning was occuring; modified the check for booleans
  to only do so if a string is detected.

MadCat34/zend-config,akomm/zend-config,akrabat/zend-config,Maks3w/zend-config