Werk #15313: Fix memory column in docker view

Component	Setup
Title	Fix memory column in docker view
Date	Dec 4, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.2.0p17 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.1.0p38 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Memory used column was always empty.

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