MotdConfig: Remove redundant 'public' modifier from interface

Change-Id: I932d1ee369b961d2d13f524e245fefe0b38b88cb
diff --git a/src/main/java/com/googlesource/gerrit/plugins/motd/MotdConfig.java b/src/main/java/com/googlesource/gerrit/plugins/motd/MotdConfig.java
index 82b3615..d4521db 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/motd/MotdConfig.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/motd/MotdConfig.java
@@ -15,7 +15,7 @@
 
 import java.util.List;
 
-public interface MotdConfig {
+interface MotdConfig {
 
   List<Subnet> getSubnets();