Fullstack false doesn't disable fullstack

**Problem**

In the git version of the cli, passing `--fullstack false` still shows and builds fullstack

**Steps To Reproduce**

Steps to reproduce the behavior:

- clone dioxus
- install the cli
- run `dx serve --example repo_readme --fullstack false`
- see
```sh
11:14:07 [dev] 🚫dx and dioxus versions are incompatible!
• dx version: 0.7.9
• dioxus versions: [0.8.0-alpha.0]
11:14:08 [dev] -----------------------------------------------------------------
Serving your app: repo_readme! 🚀
• Press `ctrl+c` to exit the server
• Press `r` to rebuild the app
• Press `p` to change hotreload mode
• Press `v` to toggle verbose logging
• Press `/` for more commands and shortcuts
Learn more at https://dioxuslabs.com/learn/0.7/getting_started
----------------------------------------------------------------
11:14:08 [dev] Note: Rust hot-patching is now enabled by default! Unexpected behavior might occur. Press `p` to change modes.
╭────────────────────────────────────────────────────────────────────────────────── /:more ╮
│ App: ━━━━━━━━━━━━━━━━━━━━━━━━━━ ◒ 1.7s Platform: MacOS + fullstack │
│ Server: ━━━━━━━━━━━━━━━━━━━━━━━━━━ ◒ 1.7s Hotreload: hot-patching ✓ │
│ Status: Compiling 5/520 futures_core Address: http://127.0.0.1:63335 │
╰──────────────────────────────────────────────────────────────────────────────────────────╯
```

**Expected behavior**

No fullstack

**Environment:**

- Dioxus version: main
- Rust version: nightly
- OS info: macOS
- App platform: web