Fix bug where CC value is ignored on intial parse from commit message

Summary: While I thought this was complicated, there was nothing subtle or
tricky here -- I just misnamed a variable.

Test Plan: Created a revision with default CCs, got CCs instead of nothing.

Reviewers: aran, jungejason, tuomaspelkonen

Reviewed By: aran

CC: aran

Differential Revision: 834

src/applications/differential/field/specification/ccs/DifferentialCCsFieldSpecification.php

@@ -98,7 +98,7 @@ final class DifferentialCCsFieldSpecification
   }
 
   public function setValueFromParsedCommitMessage($value) {
-    $this->value = nonempty($value, array());
+    $this->ccs = nonempty($value, array());
     return $this;
   }