fix: Fix mixed up naming "upcast" <-> "downcast" for runtime checks

[danaugrs]

Fixes #2422.

[JesseCodeBones]

I have no permission to edit, but I can tell you the root cause.
wat file will store the error message with utf8 format, as you changed the error message, you should change its wat as well.
postion: line 41 at debug.wat
new message: (data (i32.const 540) "<\00\00\00\00\00\00\00\00\00\00\00\01\00\00\00&\00\00\00u\00n\00e\00x\00p\00e\00c\00t\00e\00d\00 \00d\00o\00w\00n\00c\00a\00s\00t\00\00\00\00\00\00\00")

position: line 37 at release.wat
new message: (data (i32.const 1576) "\01\00\00\00\"\00\00\00u\00n\00e\00x\00p\00e\00c\00t\00e\00d\00 \00d\00o\00w\00n\00c\00a\00s\00t").

Good luck!

[MaxGraey]

Just recreate all fixtures via ASC_FEATURES="*" npm run test:compiler -- --create command to make sure

[danaugrs]

I've regenerated all the fixtures and pushed the changes. Thanks for the help guys!

[danaugrs]

@MaxGraey I don't have write access so I can't merge (just letting you know in case you are waiting for me to do so).

[MaxGraey]

@danaugrs We have an automatic release process (via github action) so we usually collect and merge a bunch of PRs at once. I'll begin the merging process soon

[MaxGraey]

Thanks!