Update JFifMarkerTests.cs

Author: JimBobSquarePants

tests/ImageSharp.Tests/Formats/Jpg/JFifMarkerTests.cs

@@ -46,15 +46,6 @@ public void MarkerIgnoresIncorrectValue()
         Assert.Equal(default, marker);
     }
 
-    [Fact]
-    public void MarkerIgnoresCorrectHeaderButInvalidDensities()
-    {
-        bool isJFif = JFifMarker.TryParse(this.bytes3, out JFifMarker marker);
-
-        Assert.False(isJFif);
-        Assert.Equal(default, marker);
-    }
-
     [Fact]
     public void MarkerEqualityIsCorrect()
     {