Bug#933868: grunt should look for tasks in /usr/share/nodejs as well

[Pirate Praveen]

Package: grunt
version: 1.0.1-8
severity: grave

node-grunt-webpack and others now install in /usr/share/nodejs and this 
patch ->
https://salsa.debian.org/js-team/grunt/blob/master/debian/patches/add-root-variable.patch 
should be updated to handle the new path.