If spatialite detected, mark idx_XXX_Geometry tables as hidden

[simonw]

https://timezones-api.now.sh/timezones-faf26d0

Need to update this logic:

datasette/datasette/app.py

Lines 1276 to 1288 in e2750c7

	if detect_spatialite(conn):
	# Also hide Spatialite internal tables
	hidden_tables += [
	'ElementaryGeometries', 'SpatialIndex', 'geometry_columns',
	'spatial_ref_sys', 'spatialite_history', 'sql_statements_log',
	'sqlite_sequence', 'views_geometry_columns', 'virts_geometry_columns'
	]
	for t in tables.keys():
	for hidden_table in hidden_tables:
	if t == hidden_table or t.startswith(hidden_table):
	tables[t]['hidden'] = True
	continue

[simonw]

Hiding tables with the idx_ prefix should be good enough here, since false positives aren't very harmful.