Update [mysql_auth], fix xban2 using minetest.auth_table directly

mods/mysql_auth

@@ -1 +1 @@
-Subproject commit 333fc8916e05a1d53e5549158980d23d585a7b88
+Subproject commit 5cebbaf03c18f8fccfc188f34af864dd3008fbf9

mods/xban2/gui.lua

@@ -9,7 +9,8 @@ local ESC = minetest.formspec_escape
 local function make_list(filter)
 	filter = filter or ""
 	local list, n, dropped = { }, 0, false
-	for k in pairs(minetest.auth_table) do
+	local enumerate = minetest.get_auth_handler().enumerate_auths
+	for k in enumerate and enumerate() or pairs(minetest.auth_table) do
 		if strfind(k, filter, 1, true) then
 			if n >= MAXLISTSIZE then
 				dropped = true