OpenPGP Applet system tray icon should be themable

make_icon_source should use something like g_themed_icon_new_from_names, e.g. so that Tails’ Windows Camouflage mode can set different icons without resorting to ugly hacks.

Parent Task: #7377 (closed)

Related issues

Related to #7742 (closed)

Original created by @alant on 7406 (Redmine)

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