Use ChangeControl from ChangeNotes

Use the canonical way of getting change control using the
change notes, since the removal of controlForIndexedChange
method on ProjectControl.

Natural follow-up of the clean-up on Gerrit master
of the ways of getting ChangeControl.

Change-Id: I2a4615e588764517e062eafa69ceb7dd4d8258a0
diff --git a/github-plugin/src/main/java/com/googlesource/gerrit/plugins/github/git/PullRequestCreateChange.java b/github-plugin/src/main/java/com/googlesource/gerrit/plugins/github/git/PullRequestCreateChange.java
index 7b536a2..b52750b 100644
--- a/github-plugin/src/main/java/com/googlesource/gerrit/plugins/github/git/PullRequestCreateChange.java
+++ b/github-plugin/src/main/java/com/googlesource/gerrit/plugins/github/git/PullRequestCreateChange.java
@@ -200,11 +200,12 @@
     if (destChanges.size() == 1) {
       // The change key exists on the destination branch: adding a new
       // patch-set
-      Change destChange = destChanges.get(0).change();
+      ChangeData destChangeData = destChanges.get(0);
+      Change destChange = destChangeData.change();
       ChangeControl changeControl =
           projectControlFactory
               .controlFor(project.getNameKey())
-              .controlForIndexedChange(destChange);
+              .controlFor(destChangeData.notes());
       insertPatchSet(bu, repo, destChange, pullRequestCommit, changeControl, pullRequestMesage);
       return destChange.getId();
     }