UX elements still jump due to WiFi list height change

### What Happened?

During the discussion in https://github.com/elementary/wingpanel-indicator-network/issues/134 we all somehow forgot that other elements in the Network indicator are also affected by the unfixed height of the indicator. Case in point - **Settings**.

I often run into the issue (again) when wanting to access settings, e.g. to retrieve a password for the current network (sidenote - have you seen _that_ dialog lately? very _very_ oldschool, nothing like elementary).

### Steps to Reproduce

1. open the network indicator by clicking its icon in wingpanel
2. wait 1-2s
3. see the indicator changing size due to more wifi networks being loaded

### Expected Behavior

The UI should have consistent size and elements should not jump "randomly" from under users' mouse cursors.

Consider:

- moving Settings to the top as an icon next to the "airplane mode"
- hidden networks - :shrug:

### OS Version

7.x (Horus)

### Software Version

Latest release (I have run all updates)

### Log Output

_No response_

### Hardware Info

_No response_