fix lint

portal.go

@@ -3502,7 +3502,7 @@ func (portal *Portal) convertMediaMessage(intent *appservice.IntentAPI, source *
 	}
 
 	// Sticker events require the URL field to be present https://spec.matrix.org/v1.9/client-server-api/#events-16
-        // This seems to affect only clients based on the Rust SDK on encrypted channels (like Element X)
+	// This seems to affect only clients based on the Rust SDK on encrypted channels (like Element X)
 	if typeName == "sticker" && converted.Content.File != nil {
 		converted.Content.URL = converted.Content.File.URL
 	}