Remove httpRootPath prefix from routes

[thiagoelg]

Fixes #70

Removes the httpRootPath prefix from quarkus-oidc-proxy routes as Quarkus already does this automatically.

[sberyozkin]

@thiagoelg I've borrowed this idea from the quarkus webauthn extension.

Can you give me a favor please and add one more test here. Copy OidcProxyTest into OidcProxyHttpRootTest, and have another application-http-root.properties where a custom http root is set, and do .addAsResource("application-http-root.properties", "application.properties") during the test setup.

Thanks

[sberyozkin]

Forgot to press Approve, so confirm it was Approved