Config watch is overridden by default value

[DerYeger]

Describe the bug

The fix added in 837711d does not work properly.
Adding watch: false to the config and running vitest will enter watch mode, since the default value is set at the user options level, which overwrites the test config.

We have to set the default value outside the user options (in the defaults) as done in #717.

Reproduction

1. Add watch: false to the test config.
2. Run vitest.

Can be reproduced in the Vitest repo.

System Info

System:
    OS: macOS 12.1
    CPU: (8) arm64 Apple M1
    Memory: 194.22 MB / 16.00 GB
    Shell: 5.8 - /bin/zsh
  Binaries:
    Node: 16.13.2 - ~/.volta/tools/image/node/16.13.2/bin/node
    Yarn: 1.22.17 - ~/.volta/tools/image/yarn/1.22.17/bin/yarn
    npm: 8.1.2 - ~/.volta/tools/image/node/16.13.2/bin/npm
  Browsers:
    Chrome: 98.0.4758.80
    Safari: 15.2
  npmPackages:
    vite: ^2.7.13 => 2.7.13 
    vitest: workspace:* => 0.3.1

Used Package Manager

pnpm

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