Base: Rename Cupertino window-close-modified-hover.jpg to .png

It's a png file, not a jpeg file, so give it the correct name.
If I read WindowFrame.cpp right, the hover bitmap only works if
the file is named .png, too.

(Noticed by running `find Base/res/icons -name '*.jpg'`.)
This commit is contained in:
Nico Weber 2023-06-13 19:48:58 -04:00 committed by Andreas Kling
parent bd26d022ac
commit 31c9fe5c32