Use more accurate battery indicator than upower

When using adwaita icon theme, their legacy upower support is broken

https://gitlab.gnome.org/GNOME/adwaita-icon-theme/-/issues/95

It would be preferable to have more accurate indicator of battery percentage by using the current gnome scheme:

• battery-level-0-charging-symbolic
• battery-level-0-symbolic
• battery-level-10-charging-symbolic
• battery-level-10-symbolic
• battery-level-20-charging-symbolic
• battery-level-20-symbolic
• battery-level-30-charging-symbolic
• battery-level-30-symbolic
• battery-level-40-charging-symbolic
• battery-level-40-symbolic
• battery-level-50-charging-symbolic
• battery-level-50-symbolic
• battery-level-60-charging-symbolic
• battery-level-60-symbolic
• battery-level-70-charging-symbolic
• battery-level-70-symbolic
• battery-level-80-charging-symbolic
• battery-level-80-symbolic
• battery-level-90-charging-symbolic
• battery-level-90-symbolic
• battery-level-100-charged-symbolic
• battery-level-100-symbolic
• battery-missing-symbolic