Use "reply" emoji. (#92)

Also don't trust the question-answer to understand the usage of thread/reply emoji.

Author: jonthegeek

R/app_server.R

@@ -224,8 +224,7 @@
       ),
       thread_tag = .has_reaction(
         .data$reactions,
-        "thread",
-        .data$user,
+        c("thread", "reply"),
         mentors
       ),
       nevermind = .has_reaction(