Update references to include prerelease version

Remove unneeded watch ignore entries

src/Connected.Components.Showcase.Runner/Connected.Components.Showcase.Runner.csproj

@@ -7,8 +7,8 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly" Version="7.0.*" />
+    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly" Version="7.0.*-*" />
-    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.DevServer" Version="7.0.*" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.DevServer" Version="7.0.*-*" PrivateAssets="all" />
   </ItemGroup>
 
   <ItemGroup>
@@ -22,9 +22,4 @@
 		<Watch Remove="..\..\src\**\bin\**" />
 	</ItemGroup>
 
-
-	<ItemGroup>
-	  <Watch Remove="Program.cs" />
-	</ItemGroup>
-
 </Project>