[shotwell] Fix ImageHeight->ImageLength confusion

[Jens Georg <jensgeorg src gnome org>]

commit 1f4532a1af03a444fc3608c47ba8152bcb547a98
Author: Jens Georg <mail jensge org>
Date:   Thu Oct 25 10:14:48 2018 +0200

    Fix ImageHeight->ImageLength confusion

 src/photos/PhotoMetadata.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/photos/PhotoMetadata.vala b/src/photos/PhotoMetadata.vala
index 2c2d6c5a..80018c2d 100644
--- a/src/photos/PhotoMetadata.vala
+++ b/src/photos/PhotoMetadata.vala
@@ -872,7 +872,7 @@ public class PhotoMetadata : MediaMetadata {
     public static string[] HEIGHT_TAGS = {
         "Exif.Photo.PixelYDimension",
         "Xmp.exif.PixelYDimension",
-        "Xmp.tiff.ImageHeight",
+        "Xmp.tiff.ImageLength",
         "Xmp.exif.PixelYDimension"
     };