fix issue with double encoding of mqtt presigned urls

[daphid4]

Description

This fixes a bug found when using AWS presigned urls - the consensus is that the url was being double encoded and therefore always resulting in a 403

Related Issue

#643
https://community.hivemq.com/t/connect-mqtt-broker-with-pre-signed-url/751/8

Type of Change

• 📚 Examples / docs / tutorials / dependencies update
• 🔧 Bug fix (non-breaking change which fixes an issue)
• 🥂 Improvement (non-breaking change which improves an existing feature)
• 🚀 New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to change)
• 🔐 Security fix

Checklist

• I've written tests (if applicable) for all new methods and classes that I created.
• I've added documentation as necessary so users can easily use and understand this feature/fix.

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