deleteMe cookie should use the defined "sameSite"

With Chrome increasing security of cookies not defining any SameSite options, the deleteMe cookie may be blocked by Chrome under some circumstances.
For example, when an app is used within a cross-site iframe, one must defined the option SameSite=None option. This works for the main cookie, but the deleteMe is currently blocked. This commit fixes this.

web/src/main/java/org/apache/shiro/web/servlet/SimpleCookie.java

@@ -398,7 +398,7 @@ public void removeFrom(HttpServletRequest request, HttpServletResponse response)
         int version = getVersion();
         boolean secure = isSecure();
         boolean httpOnly = false; //no need to add the extra text, plus the value 'deleteMe' is not sensitive at all
-        SameSiteOptions sameSite = null;
+        SameSiteOptions sameSite = getSameSite();
 
         addCookieHeader(response, name, value, comment, domain, path, maxAge, version, secure, httpOnly, sameSite);