Refactor ChannelWrapper to only set log channel if it's not part of context

This is to allow local override of log channel.

This can be needed if a class does say both payment and accounting
and you want messages log to separate channels for does

Author: sunkan

src/Wrapper/ChannelWrapper.php

@@ -17,7 +17,9 @@ public function __construct(
 	 */
 	public function log($level, string|\Stringable $message, array $context = []): void
 	{
-		$context['channel'] = $this->channel;
+		if (!isset($context['channel'])) {
+			$context['channel'] = $this->channel;
+		}
 		$this->logger->log($level, $message, $context);
 	}
 }