Fix Code_Saturne mesh probe location

When executing the Code_Saturne example with Code_Saturne 6.0.5 or 6.2.0, there is a warning in RESU/<timestamp>/run_solver.log:

 Warning: probe set "probes"
   1 (of 8) probes are not located on the associated mesh:
    1 ([2.500e-01, 2.250e+00, 0.000e+00])

 Probe set: "probes":
   maximum distance between cell centers and requested coordinates: 2.507e-01

The probes are defined in case1.xml.