[test][swe] Actually use new viscous flux in the test

Merged Timo Koch requested to merge fix/shallowwawter-frcitionlaw-interface-requirements into master

Turns out the viscous flux was never executed because the wrong parameter was set in the input file. After I turned it on the solution changed. I updated the reference. @fwplatzek Can you make sure that the result still looks like what you would expect?

Edited by Timo Koch

Merge request reports