[Blazor] Fix Blazor.build package (#17463)

Author: pranavkm

src/Components/Blazor/Build/src/Microsoft.AspNetCore.Blazor.Build.nuspec

@@ -11,7 +11,7 @@
     <file src="..\..\..\THIRD-PARTY-NOTICES.txt" />
     <file src="build\**" target="build" />
     <file src="targets\**" target="targets" />
-    <file src="$taskskDir$\*" target="tools/" />
+    <file src="$taskskDir$\**" target="tools/" />
     <file src="..\..\..\Web.JS\dist\$configuration$\blazor.webassembly.js" target="tools/blazor" />
   </files>
 </package>