Ensure existing subprocess wrapper is called

[deldesir]

Describe the bug/problem

The current implementation in editbooks.py utilizes direct imports from the subprocess module, which diverges from the consistent practice within the Calibre-Web codebase. To ensure uniformity and maintain code standardization, the file should use the subproc_wrapper.py as an interface for interacting with subprocesses, for #6.

To Reproduce

There is no specific bug to reproduce; this issue pertains to code consistency and best practices within the Calibre-Web project.

Expected behavior

Refactoring the code in editbooks.py to utilize the subproc_wrapper.py should lead to seamless subprocess operations in line with the established code standards.

Environment (please complete the following information):

• OS: Ubuntu 23.10
• Python version: 3.11.6
• Calibre-Web version: 0.6.21 - Romesa (customized per Support additional media upload and download  #7 )
• Docker container: No
• Special Hardware: No
• Browser: Firefox Nightly 121.0a1 (2023-10-31) (64-bit)

Additional context

It's recommended to review the code changes thoroughly, ensuring that the substitution from direct subprocess imports to the subproc_wrapper.py maintains or improves the functionality without introducing any regressions. The modification should promote uniformity in the codebase and simplify future maintenance tasks related to subprocess interactions.