Fix missing copyright statement in ChangeScreen2 code

This new file was refactored from elsewhere and I missed adding the
copyright header. Shame on me. Its still only my code so I hereby
assert its Apache License 2.0. :-)

Change-Id: Ife4918fb32d62369e1c74c8260652be764428f01

gerrit-gwtui/src/main/java/com/google/gerrit/client/change/ReplyAction.java

@@ -12,7 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-
 package com.google.gerrit.client.change;
 
 import com.google.gerrit.client.changes.ChangeInfo;