Settings screen protection insufficient

[rugk]

In case I am righht with https://github.com/onyxbits/remotekeyboard/issues/19 and the settings screen should be protected against remote input, here is a way to work around it:

1. Disable RK. (choose another keyboard)
2. Go into the settings.
3. Switch to another app with text input.
4. Activate RK there and connect to it.
5. Switch back to the RK app.

Now you can easily enter a new password there. I think this is not wanted.