desktop: Add categories
Detected by Debian's lintian https://lintian.debian.org/tags/desktop-entry-lacks-main-category.html
System
is the Main .desktop category for this app. Monitor
is a registered Additional Category.
Detected by Debian's lintian https://lintian.debian.org/tags/desktop-entry-lacks-main-category.html
System
is the Main .desktop category for this app. Monitor
is a registered Additional Category.