fix: set table prefix on query grammar

[erikgaal]

Using a table_prefix only works in migrations, and not in other queries.

Looks like we're missing a setTablePrefix here.

[tpetry]

Thanks for the fix! That was a very embarassing finding of you because I was the one making that change in the Laravel core and missed adding it to my own library too... 😅

[tpetry]

This is now live with 0.35.0