"+" icon in space with no create room rights shows explore rooms screen

### Steps to reproduce

1. Navigate to a space where you don't have room creation rights
2. Click the #+ button on the bottom right

https://user-images.githubusercontent.com/20701752/174231089-244a56b1-6a34-4633-a4b5-250dcd749d1d.mp4

### Outcome

#### What did you expect?

Either the button is invisible or a different UX

#### What happened instead?

You're in explore rooms with no rights to add a room

### Your phone model

Pixel 6 Pro

### Operating system version

Android 12

### Application version and app store

1.4.24-dev

### Homeserver

matrix.org

### Will you send logs?

No

### Are you willing to provide a PR?

Yes