[Users] Schedule change in Exact.

[Eloisa Bentivegna]

Hello,

I'd like to propose the following patch for the schedule.ccl of thorn Exact:

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135a136,140
 >
 >   schedule Exact__initialize in MoL_PostStep
 >   {
 >     LANG: Fortran
 >   } "Set data from exact solution on an exact slice"
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This should ensure that Exact__initialize is executed after regridding, 
in the same way that Exact__gauge already is.

Thanks!
Eloisa