Fix EnablChannelViewedMessages typo (#6822)

* Update config.json

* Update config.go

* Update config.go

* Update channel.go

* Update post.go

* Update diagnostics.go

* Update config.go

config/config.json

@@ -45,7 +45,7 @@
         "EnablePostSearch": true,
         "EnableUserTypingMessages": true,
         "EnableUserStatuses": true,
-        "EnablChannelViewedMessages": true,
+        "EnableChannelViewedMessages": true,
         "ClusterLogTimeoutMilliseconds": 2000
     },
     "ElasticSearchSettings": {
@@ -287,4 +287,4 @@
     "DataRetentionSettings": {
         "Enable": false
     }
-}
+}