Update test-grid.cpp
Update test-grid.cpp

Remove unnecessary code.
craigsapp/minHumdrum,craigsapp/humlib,humdrum-tools/minHumdrum,craigsapp/humlib,craigsapp/humlib,humdrum-tools/minHumdrum,humdrum-tools/minHumdrum,craigsapp/minHumdrum,craigsapp/minHumdrum