BUGFIX: Display flash messages in Fusion based backend modules #3999
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Previously flash messages were not displayed in fusion based backend modules because the rendering was implemented in the BackendSubModule. This layout which was used by all BackendSubModules which had to use the same or a cloned layout.
This change moves the rendering to the template of the backend module controller which renders around all modules. This makes sense because first this is not a layout task at all and second it makes sense to always render flash messages in the backend.
Resolves. #3998
Checklist
FEATURE|TASK|BUGFIX
!!!
and have upgrade-instructions