ChangeRebuilderImpl#checkNoteDbState: Fix usage of String.format

String.format is being passed a string that uses concatenation to
include the variables. No placeholder tokens are present in the
string, and no format arguments are given.

Replace the concatenation with placeholders and format args.

Change-Id: I616864bc72707719a02da83a048492061dffab1d
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/notedb/rebuild/ChangeRebuilderImpl.java b/gerrit-server/src/main/java/com/google/gerrit/server/notedb/rebuild/ChangeRebuilderImpl.java
index 18f4c61..af0f318 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/notedb/rebuild/ChangeRebuilderImpl.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/notedb/rebuild/ChangeRebuilderImpl.java
@@ -298,8 +298,7 @@
     // Can only rebuild a change if its primary storage is ReviewDb.
     NoteDbChangeState s = NoteDbChangeState.parse(c);
     if (s != null && s.getPrimaryStorage() != PrimaryStorage.REVIEW_DB) {
-      throw new OrmException(
-          String.format("cannot rebuild change " + c.getId() + " with state " + s));
+      throw new OrmException(String.format("cannot rebuild change %s with state %s", c.getId(), s));
     }
     return c;
   }