Remove iOS and MacCatalyst from target frameworks

The project now only targets net9.0-android by default. iOS and MacCatalyst have been removed from the TargetFrameworks list, possibly to simplify builds or due to platform-specific requirements.

Author: ChrisPulman

src/Extensions.Hosting.Maui.Example/Extensions.Hosting.Maui.Example.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <IsPackable>false</IsPackable>
-    <TargetFrameworks>net9.0-android;net9.0-ios;net9.0-maccatalyst</TargetFrameworks>
+    <TargetFrameworks>net9.0-android;</TargetFrameworks>
     <TargetFrameworks Condition="$([MSBuild]::IsOSPlatform('windows'))">$(TargetFrameworks);net9.0-windows10.0.19041.0</TargetFrameworks>
 
     <!-- Note for MacCatalyst: