Allow for themed borders to have the inner portion

[idkman123452]

Is your feature request related to a problem? Please describe.
When using a theme that has the Windows 7 borders, the inner border is not visible

R3dfox:

Any other window:

Describe the solution you'd like
Simply have the inner border appear

Describe alternatives you've considered
I don't believe there's any other solution to this, but if there is I'll look into it

[the-r3dacted]

So previously this was supposed to be fixed by this commit, however I guess Mozilla changed something and it no longer fixes it.
eece588

I don't think I'll do a 147.0.4-1 since 148 is so close, but if I fix it in 148, I'll let you know @e3kskoy7wqk so you can fix it in your fork too.

[e3kskoy7wqk]

@the-r3dacted thank you!