BUG: Nekobox 4.01: Preview not work while using custome Core juicity, See attached screen catch.

[yesiamchinese]

Describe the problem

Preview not work while using custome core juicity, See attached screen catch.

Expected behavior:
Fix. Preview function in Nekobox 3.26 is working normally.

How to reproduce

1. Add New Profile in group
2. Select Custom (Extra Core)
3. Fill in name, address, port etc
4. Select juicity (Extra Core)
5. Fill in json and replace some value with %server_addr%, %server_port%, %socks_port%
6. Click Preview
7. Nekobox show "This profile is not in any group, your data may be corrupted."
8. Click OK, added juicity site working well.

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