Switch raylib/log to using static buffer

[jan-beukes]

This example was causing a segfault on my Linux machine. This is because of the reuse of the same va_list in a loop with vsnprintf.
I believe that just using a static buffer should be fine here since raylib's TraceLog uses a buffer of 256 by default.

Checklist before submitting:

• This example has been added to .github/workflows/check.yml (for automatic testing)
• This example compiles cleanly with flags -vet -strict-style -vet-tabs -disallow-do -warnings-as-errors
• This example the naming and style convention: https://github.com/odin-lang/examples/wiki/Naming-and-style-convention (exceptions can be made for ports of examples that need to match 1:1 to the original source).
• By submitting, I understand that this example is made available under these licenses: Public Domain and Odin's zlib license. Only for third-party dependencies are other licenses allowed.