Changes

pySim/commands: STATUS: Use indeterminate length Le/P3 == '00'

Let's have the card tell us what the length is by indicating '00'
instead of stating 'FF'.  This is better aligned with general practice
and won't break assumptions in other parts of the code like SCP
transport.

Change-Id: Ied63c6e1970e3dfc675da5e5f94579fbb06fea51