runtime: do not use the _scc object of the card object to select MF

The constructor of the RuntimeState object selects the MF befor it does
some other steps. However it does this through the _scc object of the
card object. This method is before we had lchan abstraction, so we
should now use the lchan object like in all other places.

Related: OS#5418
Change-Id: I9a751c0228c77077e3fabb50a9a68e4489e7151c

pySim/runtime.py

@@ -64,7 +64,7 @@ class RuntimeState:
                     self.mf.add_file(f)
 
         # go back to MF before the next steps (addon probing might have changed DF)
-        self.card._scc.select_file('3F00')
+        self.lchan[0].select('MF')
 
         # add application ADFs + MF-files from profile
         apps = self._match_applications()