fix: show messages tab if chain supports EIP-1271

[iamacook]

What it solves

Resolves #2101

How this PR fixes it

The messages tab is now always shown if a chain supports EIP-1271, no longer taking into account if signed messages exist.

How to test it

1. Open a Safe on a chain that supports EIP-1271 with no signed messages and observe the tab present.
2. Switch to a Safe on a chain that doesn't support EIP-1271 and observe no tab present.

Checklist

• I've tested the branch on mobile 📱
• I've documented how it affects the analytics (if at all) 📊
• I've written a unit/e2e test for it (if applicable) 🧑‍💻

[github-actions]

ESLint Summary View Full Report

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Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	0	N/A

• Result: ✅ success
• Annotations: 0 total

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^{Report generated by eslint-plus-action}