profiles: info-dir-file: Remove install-info '--silent' option.

Relates to <https://issues.guix.gnu.org/58821>.

Revert 4fef1e850e, which silenced useful
information such as the following warning:

   install-info: warning: no info dir entry in
   `/gnu/store/...-rottlog-0.72.2/share/info/rottlog.info.gz'

Rationale: profile hooks output is now hidden by default, and can be made
visible via the --verbosity option.

guix/profiles.scm

@@ -1034,7 +1034,7 @@ MANIFEST."
               (setenv "LANGUAGE" language)
               (zero?
                (system* #+(file-append texinfo "/bin/install-info")
-                        "--silent" info
+                        info
                         (apply string-append #$output "/share/info/dir"
                                (if (string=? "en" language)
                                    '("")