"Unable to open the link" errors when attempting to open link on iOS 14

**Describe the bug**
When a browser other than Safari is set as the default browser in iOS 14, Element is unable to open any web links.

**To Reproduce**
Steps to reproduce the behavior:
1. Install Firefox for iOS
2. Open the iOS settings app, locate Firefox, and open its settings
3. Locate the "Default Browser App" setting and change it from Safari to Firefox
4. Open Element, join a channel, find any link, and tap on it

**Expected behavior**
The link opens in the default web browser.

**Screenshots**
If applicable, add screenshots to help explain your problem.

**Smartphone (please complete the following information):**
- Device: iPhone SE (First Gen)
- OS: iOS 14.0.1
- Browser: Firefox for iOS v28.2
- Version: 1.0.12 master

**Additional context**
Add any other context about the problem here.