Specify dbscheme in tutorial-queries

Since we're deleting tutorial-lib, we'll need a way to point at our
dbscheme.

We were initially doing this in tutorial-lib/qlpack.yml.

We're now doing this in tutorial-queries/qlpack.yml.

Author: elenatanasoiu

tutorial-queries/codeql-pack.yml

@@ -1,4 +1,5 @@
 name: getting-started/tutorial-queries
 version: 0.0.1
+dbscheme: csv.dbscheme
 dependencies:
   codeql/tutorial: ^0.0.1