Fix openfoam solverInfo error

[sjpb]

Pre-PR fails with error:

--> FOAM FATAL IO ERROR: 
Cannot find functionObject configuration file solverInfo

Cannot see what's changed here, but from the docs it only affects informational output:

The solverInfo function object reports the solver performance information for a list of fields

hence this PR just comments-out the include for it.

From the docs this config object used to be called residuals; the benchmark already has that commented-out.

[sd109]

Tested and working so LGTM