Try to not crash on unsupported plugin load

Emby.Server.Implementations/ApplicationHost.cs

@@ -1167,7 +1167,7 @@ namespace Emby.Server.Implementations
                 {
                     exportedTypes = ass.GetExportedTypes();
                 }
-                catch (TypeLoadException ex)
+                catch (FileNotFoundException ex)
                 {
                     Logger.LogError(ex, "Error getting exported types from {Assembly}", ass.FullName);
                     continue;