Fix bug in contemp_reduced_form of SBVAR
As outlined in https://forum.dynare.org/t/different-results-of-a0-using-sbvar/15359 the attached codes crashes due to non-conformable matrices.
[MacroData.mat](/uploads/e30cd873d1add8fc54a1e0e65aa0949d/MacroData.mat)
[constantRecursiveBVAR.mod](/uploads/f7b1c204676a2323d03a467702f6e3c5/constantRecursiveBVAR.mod)
issue