CLI: rebuilds will not relaunch the iOS simulator

**Problem**

The Dioxus CLI will automatically launch the iOS simulator when initiating an iOS build. However, if you close the iOS simulator (either quit the entire app, or just close the simulator window) then a rebuild will not reopen the simulator. Instead the build will fail to deploy with:

```
16:24:02 [ios] No devices are booted.
16:24:02 [dev] Application [ios] exited with error: exit status: 148
```

**Steps To Reproduce**

Steps to reproduce the behavior:

- Run an iOS build with `dx serve --ios`
- Once it opens, close the simulator window
- Press `r` in the dx tui to rebuild

**Expected behavior**

Simulator will reopen

**Environment:**

- Dioxus version: 0.7.2
- OS info: macOS
- App platform: iOS (native/desktop)