get_config_form() should take datasette as first argument

[simonw]

Don't forget to update documentation as well.

datasette-enrichments/example-enrichments/jinja_sandbox.py

Line 18 in cb97052

async def get_config_form(self, db, table):

[simonw]

Documentation to update:

datasette-enrichments/docs/developing.md

Lines 121 to 125 in 1d3fa43

	# ...
	async def get_config_form(self, db, table):
	class ConfigForm(Form):

That documentation also needs to list all of the arguments, like it does for the other methods.