pb-console: don't modify PATH unless it's empty

We're now running pb-console through a proper login shell, so we
shouldn't need to modify PATH, as we expect it to be properly set up by
the shell profile.

This change removes the unconditional PATH modification, so we only set
a basic PATH if it's currently empty.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>

utils/pb-console

@@ -119,10 +119,8 @@ esac
 # we may have been run from udev - ensure we have a sensible PATH
 if [ -z "$PATH" ]
 then
-	PATH=/usr/bin:/usr/sbin:/bin:/sbin
+	export PATH=/usr/bin:/usr/sbin:/bin:/sbin
 fi
-PATH=/var/lib/pb-plugins/bin:$PATH
-export PATH
 
 verbose_opt=
 if $pb_config debug | grep -q enabled