remove value-return statement in void-function

Simon Praetoriusrequested to merge
simon.praetorius/dune-common:issue/switch_cases_void into master

Summary

Remove the return keyword in the void-variant of Hybrid::switchCases

Details

The current code gives the error: return-statement with a value, in function returning 'void'. This MR resolves this error.

Edited by Simon Praetorius

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