Removed incorrect using.

Author: dlemstra

src/Magick.NET/MagickImage.cs

@@ -7679,7 +7679,7 @@ private void FloodFill(IMagickColor<QuantumType> color, int x, int y, IMagickCol
 
         var settings = _settings.Drawing;
 
-        using var fillPattern = settings.FillPattern;
+        var fillPattern = settings.FillPattern;
         var fillColor = settings.FillColor;
 
         settings.FillColor = color;