T13303: Make every Echo event an alert on softcellwiki (#5847)

It was reported to not really work on Discord... Maybe going alerts
would be better?

https://issue-tracker.miraheze.org/T13303#266801

<https://wm-bot.wmcloud.org/browser/index.php?start=03%2F05%2F2025&end=03%2F05%2F2025&display=%23miraheze-tech>:
```
[05/03/2025 15:40] <MirahezeRelay> <theoneandonlylegroom> can you make the other way round
[05/03/2025 15:40] <MirahezeRelay> <theoneandonlylegroom> notifs to alerts
```

LocalWiki.php

@@ -876,7 +876,7 @@ function onBeforePageDisplay( OutputPage $out ) {
 			global $wgEchoNotifications;
 
 			foreach ( $wgEchoNotifications as &$event ) {
-				$event['section'] = 'message';
+				$event['section'] = 'alert';
 			}
 		};