Change to alwaysHex

[Crelde]

This seems to fix the issue when using web3js 4.x.x that its not possible to setProvider().

Error before gave this error:

Uncaught (in promise) s: Web3 validator found 1 error[s]:
value "1337" at "/0" must pass "hex" validation
    at c.validate (https://cdn.jsdelivr.net/npm/web3@latest/dist/web3.min.js:2:634195)
    at t.Web3Validator.validate (https://cdn.jsdelivr.net/npm/web3@latest/dist/web3.min.js:2:636887)
    at t.hexToNumber (https://cdn.jsdelivr.net/npm/web3@latest/dist/web3.min.js:2:589899)
    at alwaysNumber (http://127.0.0.1:5174/node_modules/.vite/deps/svelte-web3.js?v=d385d017:17695:60)
    at switch1193Provider (http://127.0.0.1:5174/node_modules/.vite/deps/svelte-web3.js?v=d385d017:17704:18)

You can reproduce in this repo: https://github.com/Crelde/svelte-web3-bug/tree/master

After the fix its possible to setProvider.

fixes #60

[clbrge]

Thanks for the patch... will release a new version