ts_51_011: Fix FID of EF.BCCH

It's 6F74, not 6F7F! (see TS 51.011 Section 10.3.14)

Change-Id: I9d90fa05a0f926f99a5d4832341cc8a9449df7ae
diff --git a/pySim/ts_51_011.py b/pySim/ts_51_011.py
index 3fde334..5ecf41c 100644
--- a/pySim/ts_51_011.py
+++ b/pySim/ts_51_011.py
@@ -1169,7 +1169,7 @@
             TransparentEF('6f41', None, 'EF.PUCT',
                           'Price per unit and currency table', size=(5, 5)),
             EF_CBMI(),
-            TransparentEF('6f7f', None, 'EF.BCCH',
+            TransparentEF('6f74', None, 'EF.BCCH',
                           'Broadcast control channels', size=(16, 16)),
             EF_ACC(),
             EF_PLMNsel('6f7b', None, 'EF.FPLMN',