profile: decode_select_response can be a static method

The method decode_select_response does not access any property of the
object. This means the method can be static.

Change-Id: Idd7aaebcf1ab0099cd40a88b8938604e84d8a88b
diff --git a/pySim/sysmocom_sja2.py b/pySim/sysmocom_sja2.py
index 263999d..6d49572 100644
--- a/pySim/sysmocom_sja2.py
+++ b/pySim/sysmocom_sja2.py
@@ -154,7 +154,7 @@
         self.add_files(files)
 
     def decode_select_response(self, resp_hex):
-        return pySim.ts_102_221.decode_select_response(resp_hex)
+        return pySim.ts_102_221.CardProfileUICC.decode_select_response(resp_hex)
 
 class EF_USIM_SQN(TransparentEF):
     def __init__(self, fid='af30', name='EF.USIM_SQN'):