Always download blazor-hotreload.js from app root

The middleware that we inject always listens to the root of the app. While this might not play very nicely if the app
is running off a virtual path, listening to the root is what we do with the aspnet-browser-refresh.js script and we've had no issue
reports with it thus far.

Fixes #35555

Author: pranavkm

src/Components/WebAssembly/WebAssembly/src/HotReload/WebAssemblyHotReload.cs

@@ -29,7 +29,7 @@ internal static async Task InitializeAsync()
 
             // Attempt to read previously applied hot reload deltas. dotnet-watch and VS will serve the script that can provide results from local-storage and
             // the injected middleware if present.
-            var jsObjectReference = (IJSUnmarshalledObjectReference)(await DefaultWebAssemblyJSRuntime.Instance.InvokeAsync<IJSObjectReference>("import", "./_framework/blazor-hotreload.js"));
+            var jsObjectReference = (IJSUnmarshalledObjectReference)(await DefaultWebAssemblyJSRuntime.Instance.InvokeAsync<IJSObjectReference>("import", "/_framework/blazor-hotreload.js"));
             await jsObjectReference.InvokeUnmarshalled<Task<int>>("receiveHotReload");
         }