MAUI Viewer search update

[duffh]

Description

Fixed search text input in the MAUI sample viewer.

Type of change

• Bug fix

Platforms tested on

• MAUI WinUI
• MAUI Android
• MAUI iOS
• MAUI MacCatalyst

Checklist

• Self-review of changes
• All changes work as expected on all affected platforms
• There are no warnings related to changes
• Code is commented and follows .NET conventions and standards
• Codemaid and XAML styler extensions have been run on every changed file
• No unrelated changes have been made to any other code or project files

[andy-weis]

Tested on MacCatalyst and iOS. Looks good, approved. Only further improvement I can think of is to remove any mistyped punctuation marks as that would create the same issue as trailing whitespace (on a couple occasions I accidentally added a period and all search results were dropped). Doesn't seem like much of an issue though, so up to you.

[andy-weis]

Very nice

[williambohrmann3]

Fix is good. Just curious why we're updating v.next package references in this PR?