If screenshot-plugin's multiple custom-presets are set, the output images will be overwritten.

[sor4chi]

Describe the bug

When multiple presets are defined by the user, the captured and written file is overwritten in the next loop because file save is performed multiple times without changing the file name in the loop, as shown in the code in the reference link below.

So, we need to use the other name for saving in every loop.

Reproduction

https://github.com/histoire-dev/histoire/blob/main/packages/histoire-plugin-screenshot/src/index.ts#L67

System Info

System:
    OS: macOS 12.3
    CPU: (8) arm64 Apple M1
    Memory: 109.88 MB / 16.00 GB
    Shell: 5.8 - /bin/zsh
  Binaries:
    Node: 16.13.2 - ~/.nodebrew/current/bin/node
    Yarn: 1.22.19 - /opt/homebrew/bin/yarn
    npm: 8.18.0 - /opt/homebrew/bin/npm
    Watchman: 2022.08.22.00 - /opt/homebrew/bin/watchman
  Browsers:
    Chrome: 105.0.5195.125
    Firefox: 101.0.1
    Safari: 15.4
  npmPackages:
    @histoire/plugin-screenshot: ^0.10.7 => 0.10.7 
    @histoire/plugin-vue2: ^0.10.7 => 0.10.7 
    @vitejs/plugin-vue2: ^1.1.2 => 1.1.2 
    histoire: ^0.10.7 => 0.10.7 
    vite: ^3.1.0 => 3.1.0 

Used Package Manager

npm

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• Read the Contributing Guidelines.
• Read the docs.
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• The provided reproduction is a minimal reproducible example of the bug.

[sor4chi]

I'm fixing