[selda-sqlite] foreign keys are off

[plredmond]

Description

Foreign keys are off under the sqlite backend (version selda-sqlite-0.1.7.2), despite code meant to turn them on.

Steps to reproduce

1. Make a file Main.hs with:

   import Database.Selda.SQLite
   
   main = withSQLite "test.db" $ return ()

2. Run Main.hs.

3. Do the following in the sqlite repl:

   $ sqlite3 
   SQLite version 3.45.3 2024-04-15 13:34:05
   ...
   sqlite> .open test.db
   sqlite> .dump
   PRAGMA foreign_keys=OFF;
   BEGIN TRANSACTION;
   COMMIT;
   sqlite> 
   

• Expected result: Pragma foreign_keys is ON.
• Actual result: Pragma foreign_keys is OFF.