editor and toolbar now resize correctly when window is resized; re #4068

git-svn-id: svn://develop.studip.de/studip/trunk@29315 c5b85792-5220-0410-ad23-ed5b6b8ad999
replaced 'width' with 'max-width' for toolbar; shows more edit-content in sticky toolbar mode on large screens; re #4068

git-svn-id: svn://develop.studip.de/studip/trunk@29316 c5b85792-5220-0410-ad23-ed5b6b8ad999