fix handling of KCookieAdvice::AcceptForSession
Commit 23874cab broke the handling of KCookieAdvice::AcceptForSession because strToAdvice(adviceToStr(KCookieAdvice::AcceptForSession)) now returns KCookieAdvice::Dunno. Ignore spaces in the argument of strToAdvice to properly recognize the AcceptForSession setting and restore compatibility with previous configs. BUG: 386325
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561210cd