Remove the stale node and wasm excludes from stack-auth's tasks.toml

packages/stack-auth/tasks.toml passes --exclude 'node/**' and --exclude 'wasm/**'. Those folders moved to languages/typescript/packages/auth and languages/typescript/packages/stack-auth-wasm in the import, #1001, so nothing under packages/stack-auth matches them now. coderdan found this in review of #1001.

The excludes do no harm, but they suggest folders that do not exist. Remove both.