add Atlassian Confluence login endpoints

Reference: https://confluence.atlassian.com/doc/customizing-the-login-page-163938553.html

Discovery/Web-Content/Logins.fuzz.txt

@@ -21,6 +21,7 @@
 /admnistrator.php3
 /backend/
 /cgi-bin/sqwebmail?noframes=1
+/confluence/login.vm
 /cpanel/
 /default.asp
 /exchange/logon.asp
@@ -38,6 +39,7 @@
 /login.pl
 /login.py
 /login.rb
+/login.vm
 /logon.asp
 /logon.aspx
 /logon.jsp