Remove modem user from modem group.

The existing code does not actually put this user in this group,
so the new stuff shouldn't either.

BUG=chromium:343369
TEST=None

Change-Id: I5b371403378f8224a5395c2267e40b1238b58714
Reviewed-on: https://chromium-review.googlesource.com/189619
Commit-Queue: Chris Masone <cmasone@chromium.org>
Tested-by: Chris Masone <cmasone@chromium.org>
Reviewed-by: Ben Chan <benchan@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
diff --git a/profiles/base/accounts/group/modem b/profiles/base/accounts/group/modem
index 6b437d5..cfd1f0b 100644
--- a/profiles/base/accounts/group/modem
+++ b/profiles/base/accounts/group/modem
@@ -1,3 +1,3 @@
 group:modem
 gid:241
-users:modem
+users: