Paper bag fix the getComment method of AccountSshKey

Wrong index was used in the split string array.

Signed-off-by: Shawn O. Pearce <sop@google.com>

appjar/src/main/java/com/google/gerrit/client/reviewdb/AccountSshKey.java

@@ -117,7 +117,7 @@ public final class AccountSshKey {
     if (parts.length < 3) {
       return "";
     }
-    return parts[3];
+    return parts[2];
   }
 
   public Timestamp getStoredOn() {