Remove uncalled constructors in Dav exceptions

Author: chibenwa

tmail-backend/tmail-third-party/openpaas/src/main/java/com/linagora/tmail/dav/DavClientException.java

@@ -19,7 +19,6 @@
 package com.linagora.tmail.dav;
 
 public class DavClientException extends RuntimeException {
-
     public DavClientException(String message) {
         super(message);
     }

tmail-backend/tmail-third-party/openpaas/src/main/java/com/linagora/tmail/dav/RetriableDavClientException.java

@@ -19,12 +19,7 @@
 package com.linagora.tmail.dav;
 
 public class RetriableDavClientException extends DavClientException {
-
     public RetriableDavClientException(String message) {
         super(message);
     }
-
-    public RetriableDavClientException(String message, Throwable cause) {
-        super(message, cause);
-    }
 }