Reduce global toolbar left padding when title is not used, fix title only header and partly fix RTL layouts

This is meant to build on the previous global toolbar patch. Also adds a forgotten change to title-only headers and a regression in RTL layouts.

Before:

Left aligned toolbar:

Toolbar with title:

Title only:

RTL:

After:

Left aligned toolbar:

Toolbar with title:

Title only:

RTL:

cc @teams/vdg