gbproxy: Use g_parse.sgsn_idx for paging

The ConnHdlr test stores the sgsn_idx in g_pars. Use that in the paging
tests to the correct SGSN pages the MS.
This is required for the paging reject test to pass.

Change-Id: I34cfc047b36cd6c139a78a7f171a9a99cc974a79
Related: OS#4951
1 file changed