FIX: Escaped mentions in chat excerpts

Mentions are now displayed as using the non-cooked message which fixes
the problem. This is not ideal. I think we might want to rework how
these excerpts are created and rendered in the near future.

Co-authored-by: Jan Cernik <jancernik12@gmail.com>

plugins/chat/app/models/chat_message.rb

@@ -90,7 +90,7 @@ class ChatMessage < ActiveRecord::Base
     return uploads.first.original_filename if cooked.blank? && uploads.present?
 
     # this may return blank for some complex things like quotes, that is acceptable
-    PrettyText.excerpt(cooked, max_length, { text_entities: true })
+    PrettyText.excerpt(message, max_length, { text_entities: true })
   end
 
   def cooked_for_excerpt

plugins/chat/spec/models/chat_message_spec.rb

@@ -287,24 +287,6 @@ describe ChatMessage do
         COOKED
         )
       expect(message.excerpt).to eq("https://twitter.com/EffinBirds/status/1518743508378697729")
-      message =
-        Fabricate.build(
-          :chat_message,
-          message:
-            "wow check out these birbs https://twitter.com/EffinBirds/status/1518743508378697729",
-        )
-      expect(message.excerpt).to eq(
-        "wow check out these birbs <a href=\"https://twitter.com/EffinBirds/status/1518743508378697729\" class=\"inline-onebox-loading\" rel=\"noopener nofollow ugc\">https://twitter.com/Effi...</a>",
-      )
-    end
-
-    it "returns an empty string if PrettyText.excerpt returns empty string" do
-      message = Fabricate(:chat_message, message: <<~MSG)
-      [quote="martin, post:30, topic:3179, full:true"]
-      This is a real **quote** topic with some *markdown* in it I can quote.
-      [/quote]
-      MSG
-      expect(message.excerpt).to eq("")
     end
 
     it "excerpts upload file name if message is empty" do