Fix for JavaScript module path to handle app not being hosted at the …

…root of the website (#3)

* Fix for calculating the Url Base in a wasm app served in a path different from the WebSite Root (e.g. using the href attribute element of the index.html base element)

* The most significant changes involve the modification of the `BroadcastChannelService` class constructor and the adjustment of how the `path` variable is set. The `NavigationManager` parameter has been removed from the constructor of the `BroadcastChannelService` class. The `path` variable, which was previously set using the `BaseUri` property of the `NavigationManager` instance, is now directly set to a specific string.

Changes:
1. The `BroadcastChannelService` class constructor has been modified by removing the `NavigationManager` parameter. This change simplifies the constructor and removes the dependency on the `NavigationManager`.
2. The `path` variable setting has been changed. Instead of using the `BaseUri` property of the `NavigationManager` instance, it is now directly set to the string `./_content/Blazor.BroadcastChannel/Blazor.BroadcastChannel.js`. This change makes the `path` setting more straightforward and less dependent on other variables.
3. A commented out line of code that sets the `_moduleTask` variable has been removed. The `_moduleTask` is still set in the same way, but now it uses the `path` variable instead of a hardcoded string. This change makes the code cleaner and easier to understand.

References to the code changes can be found in the `BroadcastChannelService` class and the method where the `path` variable is set.

src/Blazor.BroadcastChannel/BroadcastChannelService.cs

@@ -1,4 +1,5 @@
-using Microsoft.JSInterop;
+using Microsoft.AspNetCore.Components;
+using Microsoft.JSInterop;
 
 namespace Blazor.BroadcastChannel
 {
@@ -7,8 +8,10 @@ internal class BroadcastChannelService : IBroadcastChannelService
         private readonly Lazy<ValueTask<IJSObjectReference>> _moduleTask;
 
         public BroadcastChannelService(IJSRuntime jsRuntime)
-        {
-            _moduleTask = new(() => jsRuntime.InvokeAsync<IJSObjectReference>("import", "/_content/Blazor.BroadcastChannel/Blazor.BroadcastChannel.js"));
+        {            
+            string path = "./_content/Blazor.BroadcastChannel/Blazor.BroadcastChannel.js";
+
+            _moduleTask = new(() => jsRuntime.InvokeAsync<IJSObjectReference>("import", path));
         }
 
         public async Task<IBroadcastChannel> CreateOrJoinAsync(string channelName)