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/global_platform/install_param.py

@@ -23,7 +23,7 @@ from osmocom.tlv import *
 
 class AppSpecificParams(BER_TLV_IE, tag=0xC9):
     # GPD_SPE_013, table 11-49
-    _construct = HexAdapter(GreedyBytes)
+    _construct = GreedyBytes
 
 class VolatileMemoryQuota(BER_TLV_IE, tag=0xC7):
     # GPD_SPE_013, table 11-49
@@ -36,7 +36,7 @@ class NonVolatileMemoryQuota(BER_TLV_IE, tag=0xC8):
 class StkParameter(BER_TLV_IE, tag=0xCA):
     # GPD_SPE_013, table 11-49
     # ETSI TS 102 226, section 8.2.1.3.2.1
-    _construct = HexAdapter(GreedyBytes)
+    _construct = GreedyBytes
 
 class SystemSpecificParams(BER_TLV_IE, tag=0xEF, nested=[VolatileMemoryQuota, NonVolatileMemoryQuota, StkParameter]):
     # GPD_SPE_013 v1.1 Table 6-5