Fixed a wrong source model

The strike and dip angles in the two planar surfaces below are wrong. According to hazardlib they should be
strike=89.982545821784356, dip=9.6965470681697212 for the first surface and strike=50.686589479524628,
dip=20.790048874793129 for the second surface. Now hazardlib is providing the correct values, so the
new numbers are the correct ones. The tests are running here: https://ci.openquake.org/job/zdevel_oq-engine/652