fix(rule-of-hooks): handle var decl with destructuring

[kt3k]

This PR fixes a case of rule-of-hooks. Currently the example below doesn't produce lint diagnostics because of the handling of var declaration:

function Foo() {
  if (cond) {
    const [state, setState] = useState(0);
  }
}

This PR fixes the above case.

[CLAassistant]

All committers have signed the CLA.

[marvinhagemeister]

LGTM, nice catch