fix toolbar not fullscreen if hideSidebar is true

[Garfonso]

If you activate "hideSidebar" but not hideHeader, the header will not be fullscreen.

This is fixed in this PR by setting the 0px with for the drawer on a different element.

Do you like me to commit the build file, too?

[bratanon]

+1 for this.

[thomasloven]

Thanks!