Fix properties navigation background

[Thomas1664]

This PR doesn't fix #1689 immediately because NavigationView doesn't allow you to override the background if PaneDisplayMode is set to Top. This bug is related to WinUI. For more information, see this issue. However, you can see that this fix works if you set PaneDisplayMode to Left.

[yaira2]

@Thomas1664 Starting with #1962, we are going to use a pivot instead, @winiston2212 can you confirm if switching to a pivot will solve this issue?

[winston-de]

@yaichenbaum I was in the process of switching to a Pivot View, but stopped after realizing that tabs cannot be hidden using a Pivot View (this would cause a crash if the user tried to access a tab like shortcut settings after selecting multiple files). Sorry for the confusion.

[marcelwgn]

@yaichenbaum @Thomas1664 NavigationView uses the "NavigationViewTopPaneBackground" resource for the background of the NavigationView when display mode is set to top. It is possible to customize the background through that resource similar to "NavigationViewDefaultPaneBackground".

[yaira2]

@chingucoding Thank you for letting us know, also great to see you here 😃.