Problem/Motivation
#3257407: Use "content" region in BlockCreationTrait::placeBlock() instead of "sidebar_first" included some region overrides in tests to work-around #3257504: Empty toolbar tray displays a stray orientation toggle. Both of those have been committed now, but they were committed very close to each other so the workarounds were not removed in time. Now they are obsolete, though.
Steps to reproduce
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Proposed resolution
Remove the - now unnecessary - region overrides.
Remaining tasks
User interface changes
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API changes
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Data model changes
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