fix(Vue): nullish params in useLiveQueryImpl

[sandros94]

Fixes a small oversight on useLiveQuery and useLiveIncrementalQuery when params are nullish.

Eg. if we want to go brrr and subscribe to all updates to a particular table like:

<script setup lang="ts">
const items = useLiveQuery('SELECT * FROM my_table;')
</script>

[yacineb]

@samwillis this PR typically fixes #448

[sandros94]

Indeed, thank you @yacineb 🙏

[sandros94]

marked as draft because I think I could improve it further

[sandros94]

These latest changes both makes sure that the watcher receives an array of refs as well as returning getters values if params is an array. Also reduced the amount of if checks