Added missing ERROR value to eos::wfe::Wrapper::Type enum

eos/messages/eos_messages.proto

@@ -108,7 +108,7 @@ message Error {
 // contents. The type field of this wrapper message provides the required
 // metadata.
 message Wrapper {
-  enum Type {NONE = 0; NOTIFICATION = 1; XATTR = 2; TAPEREPLICA = 3;}
+  enum Type {NONE = 0; ERROR = 1; NOTIFICATION = 2; XATTR = 3; TAPEREPLICA = 4;}
   Type type = 1;                 //< Default value is NONE
   Error error = 2;
   Notification notification = 3;