testem: Adjust Chrome command line flags
testem: Adjust Chrome command line flags

see https://github.com/ember-cli/ember-addon-output/blob/v3.6.0/testem.js

glimmerjs/glimmer-vm,tildeio/glimmer,tildeio/glimmer,glimmerjs/glimmer-vm,glimmerjs/glimmer-vm,tildeio/glimmer