Fix for [Windows]ToolbarItem visibility until Page Disappearing #26836
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###Root Cause
When changing the Toolbar Item properties on Disappearing event , the Handler is removed in Toolbar as the items are updating on the disappearing event on windows platform
Description of Change
Handled the null possibility in OnToolbarItemPropertyChanged
Issues Fixed
Fixes #26803
Tested the behaviour in the following platforms
Output Video
Recording.2024-12-27.132438.mp4