[9.x] Remove meaningless parameter

[baijunyao]

The default value of the $prefix parameter of the addViewEvent() method is composing: 。

framework/src/Illuminate/View/Concerns/ManagesEvents.php

Line 72 in e4e40df

protected function addViewEvent($view, $callback, $prefix = 'composing: ')

So this parameter can not be passed when calling.

framework/src/Illuminate/View/Concerns/ManagesEvents.php

Line 58 in e4e40df

$composers[] = $this->addViewEvent($view, $callback, 'composing: ');