[iOS] Focus stops working for picker after it's already been focused then unfocused

[PureWeen]

Description

Picker.Focus
Picker.Unfocus
Picker.Focus <- does not work

Thinking this might be the cause
#1278

Because if you select something in the list then the focus/unfocus works fine

Steps to Reproduce

Run control gallery test Issue2339 and just try to focus then unfocus then focus again

Expected Behavior

Picker should keep being able to focus

Actual Behavior

Picker stops being able to focus

Basic Information

• Version with issue: 3.0.0
• Last known good version: 2.5.1

Implementation notes

The original purpose of the Control Gallery test was for windows but it seems from this PR
#762
That that's ok

The Issue2339 should be updated to reflect that it only applies to iOS/Android and the behavior isn't consistent on UWP on purpose

[samhouts]

closed by #2433