cmd/tsconnect: update device authorization copy

"Device Authorization" was recently renamed to "Device Approval"
on the control side. This change updates tsconnect to match.

Signed-off-by: Sonia Appasamy <sonia@tailscale.com>

cmd/tsconnect/src/app/app.tsx

@@ -38,7 +38,7 @@ class App extends Component<{}, AppState> {
     if (ipnState === "NeedsMachineAuth") {
       machineAuthInstructions = (
         <div class="container mx-auto px-4 text-center">
-          An administrator needs to authorize this device.
+          An administrator needs to approve this device.
         </div>
       )
     }

cmd/tsconnect/src/app/header.tsx

@@ -30,7 +30,7 @@ const STATE_LABELS = {
   NoState: "Initializing…",
   InUseOtherUser: "In-use by another user",
   NeedsLogin: "Needs login",
-  NeedsMachineAuth: "Needs authorization",
+  NeedsMachineAuth: "Needs approval",
   Stopped: "Stopped",
   Starting: "Starting…",
   Running: "Running",