Werk #7903: Add missing "Dissolve icon" in custom graph editor

Component	Metrics system
Title	Add missing "Dissolve icon" in custom graph editor
Date	Jul 2, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b3 Checkmk Enterprise (CEE), Checkmk MSP (CME)

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