chore: update default topos docker tag

[sebastiendan]

Description

This PR updates the default docker tag for topos in the ERC20 Messaging e2e test workflow. This follows topos-protocol/topos#339 which changed topos default docker tag from main-tce to main.

PR Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added or updated tests that comprehensively prove my change is effective or that my feature works

[sebastiendan]

Frontend ERC20 test not passing because missing the update from topos-protocol/local-erc20-messaging-infra#30