data/hello2.wasm contains xxd(1) output instead of actual binary data

Splitting from #42 (closed):

hello2.wasm is also recognised as a text file:
[jelle@natrium][~/projects/diffoscope]%file tests/data/hello1.wasm 
tests/data/hello1.wasm: WebAssembly (wasm) binary module version 0x1 (MVP)

It was committed via !17 (closed) as a literal text file of the xxd(1) output... you can probably imagine how that snuck passed review. :)

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