Swap the tool-header and header order so the tool-header
so the header is always on the window edge.
See design task: T91536.
NOTE: files saved in 3.0 will have overlapping headers when opened in any version of Blender before this commit.
Notes:
- The tool-header labels are harder to read over transparent backdrop.
- The visual separation between the tools name and labels for tool settings aren't always so obvious.

