Feature soundness test should include the wasm32 target too

[Madoshakalaka]

Our current feature soundness step is on native target only:

cargo hack clippy
-p yew -p yew-agent -p yew-router
--feature-powerset --no-dev-deps
--keep-going
-- -D warnings

It doesn't catch warnings like this one

We should run cargo hack either only on wasm32 (the major use case) or both on wasm32 and native.

[Madoshakalaka]

@WorldSEnder what do you think