Fix __init__.py insertion bug

[brianstrauch]

• Currently, generate.py tries to insert new from ... import ... statements after the first line (See Generate.py quality of life improvements #1259 and Add noracooks.com #1427 (comment)).
• It looks like the node.level > 0 condition was added to skip the first item (from __future__ import annotations, which the generator considers to be a valid scraper class), but unfortunately self.last_node = node is still reached. The second time __import() is called, the first line is self.last_node and the new import is added beneath it.
• This PR moves the node.level > 0 condition up into the parent if statement to avoid self.last_node = node from being called. Luckily, this doesn't impact the elif beneath it.
• I manually validated that we can insert a new scraper class named "AAA" and "ZZZ"

[hhursev]

Thanks for the PR! I appreciate you validating the change with edge cases like "AAA" and "ZZZ" scrapers.

Happy holidays and thanks again for contributing! 🎄 Merging.