fix: read receipts should not be removed due to message update (#1808)

**Case:**

- User A sends a message on channel
- User B reads the channel, and we show the read indicator to User A on that message
- Now User A updates the message (or adds a reaction), so updated_at field for message is greater than read timestamp for User B

**Current Implementation on React and RN**

In above case, after step 3, we remove the read receipt, since message was updated after User B read the channel

**Proposed Change**

I think we should keep the read receipt in this case. Read receipt should only be computed based on created_at timestamp of message compared with read timestamp

Author: vishalnarkhede

package/src/components/MessageList/utils/getReadStates.ts

@@ -66,7 +66,7 @@ export const getReadStates = <
            * to the array of last reads for that message and remove
            * the user from the list of users being checked
            */
-          if (message.updated_at < member.last_read) {
+          if (message.created_at < member.last_read) {
             /**
              * if this is a direct message the length will be 1
              * as we already deleted the current user from the object