Update sync plugin to use operation not action header to match server change

[samwillis]

The server was changed here: electric-sql/electric#1481

Discussed in #254

^{Originally posted by mfaridzia August 24, 2024}
Hey @samwillis before, thank you for amazing PGlite 🙏

I have a problem, I am trying to sync my electric server data to my local table in PGlite, but it's always showing an empty array. I don't have any idea where the problem is.

This is my GitHub repo: https://github.com/mfaridzia/electric/blob/main/src/PgLite2.tsx

Thank you.

[msfstef]

Addressed by #263 - will close once merged