cards: do not feed ascii as adm for sysmosim-gr1

When sysmosom-gr1 is used with a custom ADM key, then the ADM string is
not fed through h2b() like we see it with sysmo-usim-sjs1 for example.

- feed the ADM to h2b() before use

Change-Id: I0b7cab380b89612ed3b8318e014161038335fe1b
Related: OS#3405
diff --git a/pySim/cards.py b/pySim/cards.py
index 4dee0d8..e294f9a 100644
--- a/pySim/cards.py
+++ b/pySim/cards.py
@@ -338,7 +338,7 @@
 
 		# Authenticate using ADM PIN 5
 		if p['pin_adm']:
-			pin = p['pin_adm']
+			pin = h2b(p['pin_adm'])
 		else:
 			pin = h2b("4444444444444444")
 		self._scc.verify_chv(5, pin)