[Icon request] Haruna Video Player (and a couple symlinks)

[Hasshu]

• App Name: Haruna Video Player
• Icon Name: org.kde.haruna
• Description: Open source video player built with Qt/QML and libmpv.
• Webpage (optional): https://apps.kde.org/haruna/
• Original Icon:

Incidentally, a couple symlinks could be added:

1. As I mentioned in #364, gnome-abrt expects "org.freedesktop.GnomeAbrt" as its icon name these days, hence org.freedesktop.GnomeAbrt.svg = system-error.svg.

2. The KeePassXC Flatpak is official now, so org.keepassxc.KeePassXC.svg = keepassxc.svg. Oddly enough, there is #383, but it was closed by its author for some reason.

[Hasshu]

@EliverLara Thanks!