fix: invalid file path in shell-curl

[jokj624]

Description

• fix bug: Shell-Curl code generation problem with multipart/form-data file address #2849

• Fixed an issue, invalid file path was created when creating shell-curl code.
  • In a function within the httpsnippet library, append @ to the file path based on fileName.

screen shot

• current

• after

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• The pull request does not introduce any breaking changes
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[helloanoop]

Merged! Thanks @jokj624 !