Werk #8424: Fix order of metrics in custom graph designer

Component	Metrics system
Title	Fix order of metrics in custom graph designer
Date	Feb 22, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Enterprise (CEE), Checkmk MSP (CME)

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