adjointSolverName not set correctly in adjointWallVelocityLowRe

Description

"Ua" is passed as the solverName argument in the adjointBoundaryCondition constructors of adjointWallVelocityLowRe. As a result, adjointWallVelocityLowRe cannot be used if useSolverNameForFields has been set to true in optimisationDict.

Possible fixes

Replace

adjointBoundaryCondition(p, iF, "Ua")

with

adjointBoundaryCondition(p, iF, ptf.adjointSolverName_)

and

adjointBoundaryCondition(p, iF, dict.get<word>("solverName"))

in the second and third constructors of adjointWallVelocityLowRe.