Update Lua to event.listEvents to match plugos syscall (#1397)

The documentation, example, and other function names use
`event.listEvents`, but `event.list` is being registered with the
client.

plug-api/syscalls/event.ts

@@ -43,5 +43,5 @@ export function dispatchEvent(
  * @returns an array of event names
  */
 export function listEvents(): Promise<string[]> {
-  return syscall("event.list");
+  return syscall("event.listEvents");
 }