Don't specify the primary group when dropping privileges

The primary group of the "nobody" user can be named differently among
distributions, for example on Debian it is named "nogroup" instead of
"nobody", so don't specify it, in which case the correct group
will be chosen automatically.

Author: kekrby

src/main.rs

@@ -204,7 +204,6 @@ fn main() {
 
     PrivDrop::default()
         .user("nobody")
-        .group("nobody")
         .group_list(&groups)
         .apply()
         .unwrap_or_else(|e| { panic!("Failed to drop privileges: {}", e) });