Set copyAllScoresOnTrivialRebase for Code-Review by default

For the Code-Review label most users expect that the scores are copied
on trivial rebase, hence this should be the default.

Change-Id: I943b4ab15b86aa54de5ddeb4eb7f8bb969acfa0e
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>

Documentation/config-labels.txt

@@ -243,7 +243,7 @@ patch set and if it has the same code delta as the previous patch set.
 This is the case if the change was rebased onto a different parent.
 This can be used to enable sticky approvals, reducing turn-around for
 trivial rebases prior to submitting a change.
-It is recommended to enable this for the Code-Review label.
+For the pre-installed Code-Review label this is enabled by default.
 Defaults to false.
 
 [[label_copyAllScoresIfNoCodeChange]]

gerrit-server/src/main/java/com/google/gerrit/server/schema/AllProjectsCreator.java

@@ -226,6 +226,7 @@ public class AllProjectsCreator {
         new LabelValue((short) -1, "I would prefer this is not merged as is"),
         new LabelValue((short) -2, "This shall not be merged")));
     type.setCopyMinScore(true);
+    type.setCopyAllScoresOnTrivialRebase(true);
     c.getLabelSections().put(type.getName(), type);
     return type;
   }