Fix the vector embedding for Pgvector

[ollyw]

Description

Fixed the order of filter and ordering parameters

Fixes #218

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

This has been tested with pg16 with pgvector in a docker container (image pgvector/pgvector:pg16) by running the openai embedding example. The unit tests were run, but none seem relevant.
It feels that for the longer term, there could be an integration test for this

Checklist:

• I have read the Contributing documentation.
• I have read the Code of conduct documentation.
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have checked my code and corrected any misspellings