[TYPO3-core] t3lib_div::trimExplode clean up

[Dmitry Dulepov [typo3]]

Wolfgang Klinger wrote:
> and why do you use foreach($array as $index => $value)
> instead of just foreach($array as $value)
> as $index is never used anyway
> (the same with the other foreach)?

That's right. I just made copy/paste without paying attention. Thanks, 
Wolfgang!

-- 
Dmitry Dulepov
TYPO3 freelancer / TYPO3 core team member
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