Drop unnecessary scope qualifiers to please flake8

This variable is not assigned to, and so the scope qualifier is not
necessary and may be misleading.

Author: cottsay

test/test_spell_check.py

@@ -10,7 +10,6 @@
 
 @pytest.fixture(scope='module')
 def known_words():
-    global spell_check_words_path
     return spell_check_words_path.read_text().splitlines()