code cleanup.

Controllers/FilesController.cs

@@ -1,12 +1,5 @@
-using CarCareTracker.External.Interfaces;
 using CarCareTracker.Models;
-using LiteDB;
 using Microsoft.AspNetCore.Mvc;
-using System.Diagnostics;
-using static System.Net.Mime.MediaTypeNames;
-using System.Drawing;
-using System.Linq.Expressions;
-using Microsoft.Extensions.Logging;
 using CarCareTracker.Helper;
 using Microsoft.AspNetCore.Authorization;