Add setting to control if display_author() show name or org to applicants (for comments)

[frjo]

Applicants can not see staff names by default (as author on comments), they see only the org name.

I think this is a special use case that should be possible but not be the default.

https://github.com/HyphaApp/hypha/blob/700193bfe4bfcc7bdd1966d34ea8e40123e1e2ca/hypha/apply/activity/templatetags/activity_tags.py#L16-L38