Apply fixes from StyleCI

This pull request applies code style fixes from an analysis carried out by StyleCI.

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src/command/Worker.php

@@ -14,7 +14,6 @@ namespace think\worker\command;
 use think\console\Command;
 use think\console\Input;
 use think\console\input\Argument;
-use think\console\input\Option;
 use think\console\Output;
 use think\facade\Config;
 use think\worker\Worker as HttpServer;