HOTFIX: Debug mode change

This is a small hotfix that affects an aspect of debugging in DreamBox.

DreamBox runs on wasmtime, which has an option to enable debug information in WASM modules. This is intended to integrate with LLDB for debugging WASM code, however it turns out the option is too unstable to leave enabled by default - even in a very small test project of mine it caused Cranelift to panic on an otherwise perfectly valid module.

So, this patch disables debug information by default. However, I recognize it could still be useful in some cases, so you can still enable it from the commandline by adding the "--wasm-debug" flag.