[Refactor] Update Task.Run usage to await and discard returned tasks.

Fixes some race conditions.

RomRepoMgr.Core/Filesystem/Vfs.cs

@@ -59,7 +59,7 @@ public class Vfs : IDisposable
                 MountPoint = mountPoint
             };
 
-            Task.Run(() =>
+            _ = Task.Run(() =>
             {
                 _fuse.Start();
 

RomRepoMgr.Core/Workers/FileExporter.cs

@@ -498,7 +498,7 @@ public class FileExporter
         if(_filesByMachine.Count == 0)
         {
             _machinePosition++;
-            Task.Run(CompressNextMachine);
+            _ = Task.Run(CompressNextMachine);
 
             return;
         }