No dark tray icon

Created by: Schattenjager-RC

I am using Ubuntu's Radiance light theme, but Remmina's tray icon is always light too. It merges with the background and difficult to see. Please add dark inverted icon and the ability to automatically select dark or light icon depending on the system theme. Or maybe just the ability to choose icon in settings - some variants like colour/light/dark. Thanks in advance.

Here is some information about my system:

Client: Ubuntu 16.04 LTS
Remmina version: 1.2.0-rcgit.14
Desktop environment: Unity

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