Fixing the linter (again) #34892
Description
by removing all trailing whitespaces recently introduced
Depends on #34839
CC: @MatteoCati @mkoeppe
Component: refactoring
Author: Frédéric Chapoton
Branch/Commit: c41e4d7
Reviewer: Matthias Koeppe
Issue created by migration from https://trac.sagemath.org/ticket/34892