Fix tabs to spaces again...

Author: dalecurtis

index.src.html

@@ -5741,7 +5741,7 @@
         2. Assign `-1` to {{ImageDecoder/[[ImageTrackList]]}}'s
             {{ImageTrackList/[[selected index]]}}.
     4. If {{ImageDecoder/[[complete]]}} is false resolve
-	{{ImageDecoder/[[completed promise]]}} with |exception|.
+        {{ImageDecoder/[[completed promise]]}} with |exception|.
 
 ImageDecoderInit Interface {#imagedecoderinit-interface}
 --------------------------------------------------------