dependency-check: remove --unused flag
dependency-check: remove --unused flag

This is now default from dependency-check v4.0.0, which we're using
since e2d0d9ae6ed134021b52537d20e30b1023c1caa7

See:
* https://github.com/dependency-check-team/dependency-check/releases/tag/v4.0.0

cjohansen/Sinon.JS,mroderick/Sinon.JS,mroderick/Sinon.JS,cjohansen/Sinon.JS,mroderick/Sinon.JS,cjohansen/Sinon.JS