Fix reported content-length in project manager shim.

[Frizi]

Pull Request Description

Fixes dashboard errors that prevented the project list from loading when using node shim implementation of project listing commands, such as:

Could not list root folder.: Unterminated string in JSON at position 10021 (line 1 column 10022)

The issue was caused by a cut-off JSON response, due to incorrect calculation of encoded response byte length.

Checklist

Please ensure that the following checklist has been satisfied before submitting the PR:

• The documentation has been updated, if necessary.
• Screenshots/screencasts have been attached, if there are any visual changes. For interactive or animated visual changes, a screencast is preferred.
• All code follows the
  Scala,
  Java,
  and
  Rust
  style guides. In case you are using a language not listed above, follow the Rust style guide.
• All code has been tested:
  • Unit tests have been written where possible.
  • If GUI codebase was changed, the GUI was tested when built using ./run ide build.

[somebody1234]

QA passed ✔️