n-api: remove unused napi_env member · nodejs/node@9047c81

nodejs

Original file line number	Diff line number	Diff line change
`@@ -23,7 +23,6 @@ struct napi_env__ {`
`23`	`23`	`loop(_loop) {}`
`24`	`24`	`v8::Isolate* isolate;`
`25`	`25`	`node::Persistent<v8::Value> last_exception;`
`26`		`- node::Persistent<v8::ObjectTemplate> wrap_template;`
`27`	`26`	`node::Persistent<v8::ObjectTemplate> function_data_template;`
`28`	`27`	`node::Persistent<v8::ObjectTemplate> accessor_data_template;`
`29`	`28`	`napi_extended_error_info last_error;`