Change Video Topic Model for Comment Centre
Change Video Topic Model for Comment Centre

Pass display_globally to the acts_as_discussion_topic declaration. Then,
implement the from_user scope as required.

from_user currently matches all topics containing root posts by created by
any user identified by user_id.

Signed-off-by: Shen Yichen <be3bb257ef8d73236feaba36cd3e5ee9095e6819@gmail.com>

cysjonathan/coursemology2,cysjonathan/coursemology2,cysjonathan/coursemology2,Coursemology/coursemology2,Coursemology/coursemology2,Coursemology/coursemology2,Coursemology/coursemology2,Coursemology/coursemology2,Coursemology/coursemology2,Coursemology/coursemology2