ghostwriter: fix private-etc

There is no `/etc/groups` AFAIK. Existing typo likely caused this.

Committer note: The original commit is part of PR #5641.

(cherry picked from commit aea2109)

etc/profile-a-l/ghostwriter.profile

@@ -51,7 +51,7 @@ private-bin context,gettext,ghostwriter,latex,mktexfmt,pandoc,pdflatex,pdfroff,p
 private-cache
 private-dev
 # passwd,login.defs,firejail are a temporary workaround for #2877 and can be removed once it is fixed
-private-etc alternatives,ca-certificates,crypto-policies,dbus-1,dconf,firejail,fonts,gconf,groups,gtk-2.0,gtk-3.0,host.conf,hostname,hosts,ld.so.cache,ld.so.conf,ld.so.conf.d,ld.so.preload,locale,locale.alias,locale.conf,localtime,login.defs,machine-id,mime.types,nsswitch.conf,pango,passwd,pki,protocols,resolv.conf,rpc,services,ssl,texlive,Trolltech.conf,X11,xdg
+private-etc alternatives,ca-certificates,crypto-policies,dbus-1,dconf,firejail,fonts,gconf,group,gtk-2.0,gtk-3.0,host.conf,hostname,hosts,ld.so.cache,ld.so.conf,ld.so.conf.d,ld.so.preload,locale,locale.alias,locale.conf,localtime,login.defs,machine-id,mime.types,nsswitch.conf,pango,passwd,pki,protocols,resolv.conf,rpc,services,ssl,texlive,Trolltech.conf,X11,xdg
 private-tmp
 
 dbus-user filter