Resolve LHCBGAUSS-2043 (SuperChic2 scorr parameter).

In the function which prints header, corr common block definition was missing and thus it was not printing the correct variable (I do hate Fortran for this). It has absolutely no effect on functionality, just printout is wrong, but the actual variable used in execution was set properly all the time. @philten, I have fixed this straight in the Fortran code, but I see there is also python script which edits official tarball, but I could not quickly work out how to use that script and what to do in it to do this fix. Perhaps you want to have a look.

I keep it WIP until Phil can have a look to the python script. This needs to be ported also to Sim10, which has the same issue.

Closes LHCBGAUSS-2043