ve.ui.Toolbar: Clear the float before the toolbar

On wikis where certain "topicons" exist the toolbar showed a
weird blank space pushing the entire toolbar down and
ve-ui-toolbar-actions to the left.

Bug: 48734
Change-Id: Ic5f73ac1eb8c41b891dd1c67b71795cb6c456141
Merge "ve.ui.Toolbar: Clear the float before the toolbar"