Don't try to upgrade to older schemas.

git-svn-id: http://svn.igniterealtime.org/svn/repos/wildfire/trunk@6372 b35dd754-fafc-0310-a699-88a17e54d16e

src/java/org/jivesoftware/database/SchemaManager.java

@@ -181,7 +181,7 @@ public class SchemaManager {
             DbConnectionManager.closeStatement(pstmt);
         }
         // If already up to date, return.
-        if (currentVersion == requiredVersion) {
+        if (currentVersion >= requiredVersion) {
             return true;
         }
         // If the database schema isn't installed at all, we need to install it.