misc: Change overly strict isort rule

Author: JDBetteridge

pyproject.toml

@@ -82,7 +82,6 @@ ignore = ["F403", "E226", "E731", "E275", "F405", "E722", "E741", "W605"]
 line_length = 90
 known_first_party = ["devito", "examples"]
 multi_line_output = "VERTICAL_GRID_GROUPED"
-force_alphabetical_sort_within_sections = true
 # We should really do some work to eliminate this (circular imports):
 skip = ["__init__.py"]