Fix battery systray icons in Windows 8 camouflage

The battery icon is chopped in half (but that’s fixed if the icon is updated, e.g. by switching from plugged to battery). Also the battery icon doesn’t look like the one in Windows 8. See real-windows-8.1.png on #6342 (closed) for an example. Actually the ones used in Windows 8 are in gnome-theme-windows8: icons/status/20/*battery*.png. I guess it’s just a matter of moving/renaming them to what GNOME expects.

Feature Branch: gnome-theme-windows8:bugfix/7398-battery-systray

Parent Task: #6342 (closed)

Related issues

Related to #7680 (closed)

Original created by @anonym on 7398 (Redmine)

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