Werk #2714: Fixed visibility of folding arrows by making them dark

Component	HW/SW inventory
Title	Fixed visibility of folding arrows by making them dark
Date	Oct 27, 2015
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i4 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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