Fix up those class names

Author: Ian Craggs

org.eclipse.paho.mqttv5.client/src/main/java/org/eclipse/paho/mqttv5/client/persist/MqttDefaultFilePersistence.java

@@ -55,7 +55,7 @@ public class MqttDefaultFilePersistence implements MqttClientPersistence {
 
 	private static FilenameFilter getFilenameFilter(){
 		if(FILENAME_FILTER == null){
-			FILENAME_FILTER =  new PersistanceFileNameFilter(MESSAGE_FILE_EXTENSION);
+			FILENAME_FILTER =  new PersistenceFileNameFilter(MESSAGE_FILE_EXTENSION);
 		}
 		return FILENAME_FILTER;
 	}
@@ -267,7 +267,7 @@ private boolean isSafeChar(char c) {
 	 * @param dir The directory in which to scan and restore backups
 	 */
 	private void restoreBackups(File dir) throws MqttPersistenceException {
-		File[] files = dir.listFiles(new PersistanceFileFilter(MESSAGE_BACKUP_FILE_EXTENSION));
+		File[] files = dir.listFiles(new PersistenceFileFilter(MESSAGE_BACKUP_FILE_EXTENSION));
 
 		if (files == null) {
 			throw new MqttPersistenceException();

org.eclipse.paho.mqttv5.client/src/main/java/org/eclipse/paho/mqttv5/client/persist/PersistenceFileFilter.java

@@ -3,11 +3,11 @@
 import java.io.File;
 import java.io.FileFilter;
 
-public class PersistanceFileFilter implements FileFilter{
+public class PersistenceFileFilter implements FileFilter{
 
 	private final String fileExtension;
 
-	public PersistanceFileFilter(String fileExtension){
+	public PersistenceFileFilter(String fileExtension){
 		this.fileExtension = fileExtension;
 	}
 

org.eclipse.paho.mqttv5.client/src/main/java/org/eclipse/paho/mqttv5/client/persist/PersistenceFileNameFilter.java

@@ -3,11 +3,11 @@
 import java.io.File;
 import java.io.FilenameFilter;
 
-public class PersistanceFileNameFilter implements FilenameFilter{
+public class PersistenceFileNameFilter implements FilenameFilter{
 
 	private final String fileExtension;
 
-	public PersistanceFileNameFilter(String fileExtension){
+	public PersistenceFileNameFilter(String fileExtension){
 		this.fileExtension = fileExtension;
 	}