Fix the bugs that search/reload will disappear when using other ExtraNetworks extensions

[KohakuBlueleaf]

Description

When disable built-in lora or enable some other ExtraNetworks extensions. The ui callback will not setup for reload/search. Change the check to >=6 which is Hypernet+TI+ckpt * 2. To allow more extranetworks or disable the built-in lora.

Checklist:

• [x] I have read contributing wiki page
• [x] I have performed a self-review of my own code
• [x] My code follows the style guidelines
• [x] My code passes tests