Built-in tray icon is used instead of system icon on Linux

[figure002]

GoldenDict always uses its built-in icon for the tray icon. This is fine on Windows, but on Linux it should lookup the icon in a specific set of folders. This is to support icon themes, a set of icons that share a common look and feel. The user can then select the icon theme that they want to use, and all apps use icons from the theme.

The Icon Theme Specification describes how to locate and install icons on Linux.