Get rid of [now] superfluous HexAdapter

With the introduction of using osmocom.construct.{Bytes,GreedyBytes}
in Change-Id I1c8df6350c68aa408ec96ff6cd1e405ceb1a4fbb we don't have a
need for wrapping each instance of Bytes or GreedyBytes into a
HexAdapter anymore.  The osmocom.construct.{Bytes,GreedyBytes} will
automatically perform the related hex-string-to-bytes conversion if
needed - and during printing we have osmocom.utils.JsonEncoder that
makes sure to convert any bytes type to a hex-string.

Change-Id: I9c77e420c314f5e74458628dc4e767eab6d97123

pySim/ts_102_310.py

@@ -27,9 +27,9 @@ from pySim.filesystem import CardDF, TransparentEF
 # TS102 310 Section 7.1
 class EF_EAPKEYS(TransparentEF):
     class Msk(BER_TLV_IE, tag=0x80):
-        _construct = HexAdapter(GreedyBytes)
+        _construct = GreedyBytes
     class Emsk(BER_TLV_IE, tag=0x81):
-        _construct = HexAdapter(GreedyBytes)
+        _construct = GreedyBytes
     class MskCollection(TLV_IE_Collection, nested=[EF_EAPKEYS.Msk, EF_EAPKEYS.Emsk]):
         pass