Add missing constructor to RestartedFCGSolver

Simon Praetoriusrequested to merge
issue/fcg_solver_constructor into master

Summary

Add missing constructor (with operator, precon, and parameter-tree) to RestartedFCGSolver

Details

The constructor with operator, precon, and parameter-tree, but without scalar-product was just missing and is added by this MR for consistency with all the other iterative solvers.

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