Update bash script to use canarynet instead of canary

[m-Peter]

Description

The CLI flag condition (https://github.com/onflow/flow-evm-gateway/blob/main/cmd/server/main.go#L60-L62) checks against a value of canarynet instead of canary.

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For contributor use:

• Targeted PR against master branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the standards mentioned here.
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

[m-Peter]

Alternatively, I can also update the CLI flag condition. Depends on whether we want to use canary or canarynet.