Remove unused reference

Emby.Server.Implementations/Emby.Server.Implementations.csproj

@@ -21,7 +21,6 @@
 
   <ItemGroup>
     <PackageReference Include="IPNetwork2" Version="2.4.0.126" />
-    <PackageReference Include="Microsoft.AspNetCore.Diagnostics" Version="2.2.0" />
     <PackageReference Include="Microsoft.AspNetCore.Hosting" Version="2.2.7" />
     <PackageReference Include="Microsoft.AspNetCore.Hosting.Abstractions" Version="2.2.0" />
     <PackageReference Include="Microsoft.AspNetCore.Hosting.Server.Abstractions" Version="2.2.0" />