Wasmer3 on context-api branch does not enable universal engine feature by default

[silwol]

Describe the bug

When using wasmer as a dependency for another project, it fails upon instantiation with this message:

Error: Compilation error: The UniversalEngine is not compiled in.

This appears to be caused by the wasmer-compiler/universal_engine feature not being enabled.

Additional context

When changing the default-universal feature in lib/api/Cargo.toml to look like this, the error is gone, no idea if this is the correct way to fix it though:

universal = [
    "engine",
    "wasmer-compiler/universal_engine",
]

[syrusakbary]

This issue was on the context_api branch, as part of this PR: #3013 and #2892