Fix wrong relay GPIO for Shelly 1PM Mini Gen3

[wildekek]

Relay GPIO 7 is TX, GPIO5 is the relay.

[netlify]

✅ Deploy Preview for esphome-devices ready!

Name	Link
🔨 Latest commit	91e6be8
🔍 Latest deploy log	https://app.netlify.com/sites/esphome-devices/deploys/66def7d9226d6000084cef0d
😎 Deploy Preview	https://deploy-preview-829--esphome-devices.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
Lighthouse	1 paths audited Performance: 89 (🔴 down 8 from production) Accessibility: 86 (no change from production) Best Practices: 100 (no change from production) SEO: 82 (no change from production) PWA: 70 (no change from production) View the detailed breakdown and full score reports

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[wildekek]

Verified by flashing config to device and confirmed it works now.