Fixed name of Thresholding.

Former-commit-id: 0d96a4c74c0854e940b0e83a45db9f4e9e910832
Former-commit-id: 9a8b9c8707634dc970078d34a79e665fc31da307
Former-commit-id: 1f05195b15d856c29f8ccdcf0d3576ef3015b18f

src/ImageProcessorCore/Profiles/Exif/ExifTag.cs

@@ -54,7 +54,7 @@ namespace ImageProcessorCore
         /// <summary>
         /// Threshholding
         /// </summary>
-        Threshholding = 0x0107,
+        Thresholding = 0x0107,
 
         /// <summary>
         /// CellWidth

src/ImageProcessorCore/Profiles/Exif/ExifValue.cs

@@ -390,7 +390,7 @@ namespace ImageProcessorCore
                     break;
                 case ExifTag.Compression:
                 case ExifTag.PhotometricInterpretation:
-                case ExifTag.Threshholding:
+                case ExifTag.Thresholding:
                 case ExifTag.CellWidth:
                 case ExifTag.CellLength:
                 case ExifTag.FillOrder:

src/ImageProcessorCore/Profiles/Exif/ExifWriter.cs

@@ -15,7 +15,7 @@ namespace ImageProcessorCore
         private static readonly ExifTag[] IfdTags = new ExifTag[93]
         {
             ExifTag.ImageWidth, ExifTag.ImageLength, ExifTag.BitsPerSample, ExifTag.Compression,
-            ExifTag.PhotometricInterpretation, ExifTag.Threshholding, ExifTag.CellWidth,
+            ExifTag.PhotometricInterpretation, ExifTag.Thresholding, ExifTag.CellWidth,
             ExifTag.CellLength, ExifTag.FillOrder,ExifTag.ImageDescription, ExifTag.Make,
             ExifTag.Model, ExifTag.StripOffsets, ExifTag.Orientation, ExifTag.SamplesPerPixel,
             ExifTag.RowsPerStrip, ExifTag.StripByteCounts, ExifTag.MinSampleValue,