TinyMCE toolbar is not sticky anymore

[Nimo-19]

After I updated my Plone5.2 Site to Plone 6 Classic it seems the TinyMCE Toolbar in the Mosaic Edit view is not sticky anymore when I scroll down.

[petschki]

Actually the toolbar_sticky option is per default true in inline mode, but unfortunately the tiny toolbar is behind the mosaic toolbar ... I'll fix this with an offset ...