Fix uppercase inconsistencies when saving users to SQL storage types (#1119)

This was causing issues when user data was saved, without UUID data being saved beforehand.

This commit fixes the way the inconsistency was introduced, and ensures that inconsistent data is made consistent in the future. (when players next login)

common/src/main/java/me/lucko/luckperms/common/storage/dao/sql/SqlDao.java

@@ -465,7 +465,7 @@ public class SqlDao extends AbstractDao {
                     // insert
                     try (PreparedStatement ps = c.prepareStatement(this.statementProcessor.apply(PLAYER_INSERT))) {
                         ps.setString(1, user.getUuid().toString());
-                        ps.setString(2, user.getName().orElse("null"));
+                        ps.setString(2, user.getName().orElse("null").toLowerCase());
                         ps.setString(3, user.getPrimaryGroup().getStoredValue().orElse(NodeFactory.DEFAULT_GROUP_NAME));
                         ps.execute();
                     }
@@ -916,7 +916,7 @@ public class SqlDao extends AbstractDao {
         String oldUsername = getPlayerName(uuid);
 
         // do the insert
-        if (!username.equalsIgnoreCase(oldUsername)) {
+        if (!username.equals(oldUsername)) {
             try (Connection c = this.provider.getConnection()) {
                 if (oldUsername != null) {
                     try (PreparedStatement ps = c.prepareStatement(this.statementProcessor.apply(PLAYER_UPDATE_USERNAME_FOR_UUID))) {