Use 'var' instead of explicit type

(cherry picked from commit 12374f7f0038e5b25548f5ab3f71122410832393)

src/NzbDrone.Common/Extensions/IEnumerableExtensions.cs

@@ -126,9 +126,9 @@ namespace NzbDrone.Common.Extensions
 
         private static IEnumerable<T> InternalDropLast<T>(IEnumerable<T> source, int n)
         {
-            Queue<T> buffer = new Queue<T>(n + 1);
+            var buffer = new Queue<T>(n + 1);
 
-            foreach (T x in source)
+            foreach (var x in source)
             {
                 buffer.Enqueue(x);