Fix/redundant message

[eben619]

Fixes: #3604

Description

Conditional rendering of the message on the modal such that it does not display if the networks being checked out in the cart are not more than 1. Even if there are multiple projects in the cart but are on the same network.

Checklist

This PR:

• Does it add new payout or donation token? In this case, have they been added to the indexer to avoid it to crash?
• Includes only changes relevant to the original ticket. Significant refactoring needs to be separated.
• Doesn't disable eslint rules.
• Doesn't work around the type checker (including but not limited to: type casts, non-null assertions, @ts-ignore, unjustified optional values).
• Doesn't contain commented out code.
• If adding/updating a feature, it adds/updates its test script on Notion.

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