Use the generic method read_binary of card class to read PLMNsel

Change-Id: I0a683c479cd41ccc6a93c23434c73793cb5dc186
diff --git a/pySim-read.py b/pySim-read.py
index 1a4c1e7..d62cdd3 100755
--- a/pySim-read.py
+++ b/pySim-read.py
@@ -153,7 +153,7 @@
 
 	# EF.PLMNsel
 	try:
-		(res, sw) = scc.read_binary(EF['PLMNsel'])
+		(res, sw) = card.read_binary('PLMNsel')
 		if sw == '9000':
 			print("PLMNsel: %s" % (res))
 		else: