26.1: Gnus icons in toolbar

[Arash Esbati]

Hi all,

many thanks for releasing 26.1.  I've built it on Win10 64bit with
Msys2/Mingw64 which worked fine.  One thing I'm observing is that Gnus
icons in toolbar are different.  With 25.3, the toolbar in Gnus' Group
Buffer looked like this:

With 26.1, it looks like this:

I also tried it with the binaries provided here[1], same result.  I
don't use toolbar, just curious why it is different.

Best, Arash

Footnotes: 
[1]  https://alpha.gnu.org/gnu/emacs/pretest/windows/