fix: mode=strict throws when plaintext in database

[richmirza]

Closes https://github.com/47ng/prisma-field-encryption/issues/106

I have a test locally too but I'm not sure of the process to update the test / integration SQLite DBs?

[franky47]

Regarding testing, you could:

1. Add a model dedicated to this test, that has two encrypted fields, one in strict mode and one without
2. Run yarn generate & DATABASE_URL="file:./db.test.sqlite" prisma db push to apply the schema changes to the SQLite template database
3. In the intergration test file, inject some cleartext data the way you did in #106 (using a raw query)
4. Check that a read on that table that matches a cleartext strict field throws an error, but that cleartext on the non-strict field doesn't throw

Thanks!