[BUG] Problem with "[" in any URL

### **Describe the bug**

Any Site with "[" in the URL-Path will get the Darkmode applied (Maybe just uses the standard-mode).
In Addition you can't unset Darkmode (No Reaction when clicking).
Note: "Closing" with ']' doesnt have any diffrent effect.
']' alone is not affected by this Bug.

### **Steps to reproduce**

- Go to any site with "[" in the Path (Not in Query-String)
- example-URL: https://github.com/darkreader/darkreader/issues/[ (This needs to be copied by hand, Github replaces '[' in the Link with "%5B")

### **System Information:**

- Browser: Chrome 87.0.4280.141
- Dark Reader version: 4.9.26