Fixed bug in matrix equals

Author: synercoder

src/Synercoding.FileFormats.Pdf/Matrix.cs

@@ -1,4 +1,4 @@
-using Synercoding.Primitives;
+using Synercoding.Primitives;
 using System;
 using System.Runtime.CompilerServices;
 
@@ -95,7 +95,7 @@ public Matrix(double a, double b, double c, double d, double e, double f)
 
         /// <inheritdoc/>
         public override bool Equals(object? obj)
-            => obj is Rectangle other && Equals(other);
+            => obj is Matrix other && Equals(other);
 
         /// <inheritdoc/>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]