Fix: Make PatchSetInserter set patch set id

Edits via the web interface don't set the patch set id in
the ChangeUpdate, so edits made via the web
have the wrong patch set id set in notedb.

This can be observed by submitting a commit message update via the usual
cli interface, then submitting a subsequent commit message
update via the web interface. The cli update increments the id in the
Patch-set trailer, while the update made via the web interface does not:

commit message update to patch set 1 via cli,
Patch-set trailer incremented to 2.

    commit 467ad806b7caf92e43759872a0419e1e20769372
    Author: Richard Ipsum <1000000@gerrit>
    Date:   Mon Jan 11 12:22:22 2016 +0000

        Update patch set 2

        Uploaded patch set 2: Commit message was updated.

        Patch-set: 2

subsequent commit message update to patch set 2 via web interface,
Patch-set trailer not incremented (should be incremented to 3)

    commit 1f05ebe246a23f9b8a8826c27513900301451caf
    Author: Richard Ipsum <1000000@gerrit>
    Date:   Mon Jan 11 12:23:53 2016 +0000

        Update patch set 2

        Patch set 3: Commit message was updated.

        Patch-set: 2

Change-Id: Ic9101e7ac1d0d181c463404976391d7d7271fa34

gerrit-server/src/main/java/com/google/gerrit/server/change/PatchSetInserter.java

@@ -44,6 +44,7 @@ import com.google.gerrit.server.git.GroupCollector;
 import com.google.gerrit.server.git.validators.CommitValidationException;
 import com.google.gerrit.server.git.validators.CommitValidators;
 import com.google.gerrit.server.mail.ReplacePatchSetSender;
+import com.google.gerrit.server.notedb.ChangeUpdate;
 import com.google.gerrit.server.notedb.ReviewerStateInternal;
 import com.google.gerrit.server.patch.PatchSetInfoFactory;
 import com.google.gerrit.server.project.ChangeControl;
@@ -210,6 +211,8 @@ public class PatchSetInserter extends BatchUpdate.Op {
     ChangeControl ctl = ctx.getChangeControl();
 
     change = ctx.getChange();
+    ChangeUpdate update = ctx.getChangeUpdate();
+
     Change.Id id = change.getId();
     final PatchSet.Id currentPatchSetId = change.currentPatchSetId();
     if (!change.getStatus().isOpen() && !allowClosed) {
@@ -223,6 +226,8 @@ public class PatchSetInserter extends BatchUpdate.Op {
     patchSet.setRevision(new RevId(commit.name()));
     patchSet.setDraft(draft);
 
+    update.setPatchSetId(patchSet.getId());
+
     if (groups != null) {
       patchSet.setGroups(groups);
     } else {