Werk #7432: postgres_instances: fix crash of the parse function

Component	Checks & agents
Title	postgres_instances: fix crash of the parse function
Date	Jul 1, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.6.0b3 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

The check crashed with the error:

TypeError (update expected at most 1 arguments, got 2)

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