fix: Remove unread messages notification

This is unnecessarily spamming the view when the chat tab is closed.
Also, this is kind of a duplicate with the blue dot on the message icon.

Signed-off-by: Louis <[email protected]>

Author: artonge

src/components/RightSidebar/RightSidebar.vue

@@ -431,11 +431,6 @@ export default {
 			if (!this.isInCall || this.opened) {
 				return
 			}
-
-			// new messages arrived
-			if (newValue > 0 && oldValue === 0 && !this.hasUnreadMentions) {
-				this.notifyUnreadMessages(t('spreed', 'You have new unread messages in the chat.'))
-			}
 		},
 
 		hasUnreadMentions(newValue) {