Simplify approving hosts

The list of waiting hosts opens the approval dialog instead of having its
own name input and buttons, so hosts are approved in one place. Removes
the limit on requests per minute, the limits on pending requests already
cap what an address can do.

Also updates text that still said the installer makes the requests.

packages/controller/src/Controller.ts

@@ -92,7 +92,7 @@ export default class Controller {
 	users: UserManager;
 	/** Instance manager for the cluster, also contains access to the user records */
 	instances: InstanceManager;
-	/** Pending requests from host installers to join the cluster */
+	/** Pending requests from hosts to join the cluster */
 	hostPairing: HostPairingManager;
 
 	// Possible states are new, starting, running, stopping, stopped