An incorrect MSVC option is applied in a debug build with static linking

**Describe the bug**

The `/MT` option is applied instead of the `/MTd` option in a statically linked debug build with Visual Studio.

There is an issue with commit b5cb2464c6d42c3688b4f51e5101adf2ae291bfd(#3803).



**To Reproduce**

Build with the `-DCMAKE_BUILD_TYPE=Debug` option and the `-DJPEGXL_STATIC=ON` option.



**Expected behavior**

The `/MTd` option is applied.



**Environment**

 - OS: Windows 11 23H2

 - Compiler version: cl.exe Version 19.41.34120 for x64

 - CPU type: x86_64



**Additional context**

I have two proposals for a fix.

- Proposal 1

    Replace the following code in `CMakeLists.txt`:



    ```cmake

    set(CMAKE_MSVC_RUNTIME_LIBRARY MultiThreaded)

    ```



    with:



    ```cmake

    set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")

    ```

- Proposal 2

    1. Remove the following code in `CMakeLists.txt`:



        ```cmake

        set(CMAKE_MSVC_RUNTIME_LIBRARY MultiThreaded)

        ```



    2. Add the `-DCMAKE_MSVC_RUNTIME_LIBRARY="MultiThreaded$<$<CONFIG:Debug>:Debug>"` option to cmake.exe.



I would prefer Proposal 2 for general purpose.



**Reference**

[CMAKE_MSVC_RUNTIME_LIBRARY](https://cmake.org/cmake/help/latest/variable/CMAKE_MSVC_RUNTIME_LIBRARY.html)

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