Werk #12072: Fix show mode always displaying show more

Component User interface
Title Fix show mode always displaying show more
Date Feb 18, 2021
Checkmk Editon Checkmk Raw (CRE)
Checkmk Version 2.1.0i1 2.0.0b7
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

This fixes a regression since werk #12058.

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