Add zkevm to dex_base_trades.sql

[chef-seaweed]

This a follow-up PR for

          just realized this won't make it to `dex.trades`, as it's a new chain and needs added to `dex_base_trades.sql`

@chef-seaweed or @Hosuke feel free to add whenever in a follow-up PR 👍

Originally posted by @jeff-dude in #5815 (comment)

[dune-eng]

Workflow run id 8810401558 approved.

[dune-eng]

Workflow run id 8810401937 approved.

[Hosuke]

Thank you @chef-seaweed

[jeff-dude]

sounds good