Update conditional for Blazor issue processing

Change the conditional checks for Blazor issues to use the link under the **Content source URL** ... something like ...

```diff
- aspnet/core/blazor
+ Content source URL\n\nhttps://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/blazor
```

```diff
- aspnet/core/blazor/hybrid
+ Content source URL\n\nhttps://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/blazor/hybrid
```