Changes

pySim-shell: update help strings for chv command parameter --pin-nr

The --pin-nr is a decimal parameter that specifies which PIN (or CHV)
to reference. The exact numbers are specified in ETSI TS 102.221,
Table 9.3.

Unfortunately the enumeration of the PIN numbers is not very intuitive.
At the moment the help suggests 1 to reference PIN1, and 2 to reference
PIN2. The value for PIN1 is correct, but for PIN2, the value should be
129.

Change-Id: I0b58c402d95cbc4fe690e6edb214829d463e9f2c