Werk #3315: Builtin icon visibility now can be correctly reset

Component	User interface
Title	Builtin icon visibility now can be correctly reset
Date	Mar 21, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.8b8 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

After changing an icon to {{Show in column}} you could never reset this back without a restart of the site Apache. This has been fixed.

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