fix: setup extension on access as well (#1628)

lua/telescope/_extensions/init.lua

@@ -16,6 +16,9 @@ extensions.manager = setmetatable({}, {
   __index = function(t, k)
     local ext = load_extension(k)
     t[k] = ext.exports or {}
+    if ext.setup then
+      ext.setup(extensions._config[k] or {}, require("telescope.config").values)
+    end
     extensions._health[k] = ext.health
 
     return t[k]