Fix Keyboard bindings (#809) · rescript-react-native/rescript-react-native@9380611

Original file line number	Diff line number	Diff line change
`@@ -28,7 +28,10 @@ type listener = keyboardEvent => unit`
`28`	`28`	`external addListener: (eventType, listener) => EventSubscription.t = "addListener"`
`29`	`29`
`30`	`30`	`@module("react-native") @scope("Keyboard")`
`31`		`-external removeListener: (eventType, listener) => EventSubscription.t = "removeListener"`
	`31`	`+external removeAllListeners: (eventType) => unit = "removeAllListeners"`
`32`	`32`
`33`	`33`	`@module("react-native") @scope("Keyboard")`
`34`	`34`	`external dismiss: unit => unit = "dismiss"`
	`35`	`+`
	`36`	`+@module("react-native") @scope("Keyboard")`
	`37`	`+external isVisible: unit => bool = "isVisible"`