Remove color attributes of 'type: data's.

lib/linguist/languages.yml

@@ -795,7 +795,6 @@ Dart:
 
 Diff:
   type: data
-  color: "#88dddd"
   extensions:
   - .diff
   - .patch
@@ -3461,7 +3460,6 @@ Unified Parallel C:
 Unity3D Asset:
   type: data
   ace_mode: yaml
-  color: "#ab69a1"
   extensions:
   - .anim
   - .asset
@@ -3818,7 +3816,6 @@ eC:
 edn:
   type: data
   ace_mode: clojure
-  color: "#db5855"
   extensions:
   - .edn
   tm_scope: source.clojure