Many icon themes, e.g. the Papirus icon theme [1], ship with a generic
icon named `bottom` under `<scale>/actions/bottom.<extension>`. This
caused the icon for the bottom application to be displayed as the
generic icon when using an icon theme that ships with it.
[1] https://github.com/PapirusDevelopmentTeam/papirus-icon-theme
The current desktop file caused an error and a hint from `desktop-file-validate` 0.28.
This commit addresses those issues:
- The "Version" field must be empty or a desktop entry specification version (e.g., 1.0, 1.5),
not the tool's version.
- The "Categories" field should only contain one main category to avoid warnings.
ref: https://specifications.freedesktop.org/desktop-entry-spec/1.5/recognized-keys.html
Tom