More formatting stuff darker didn't catch.

tools/gen_latex_symbols.py

@@ -82,6 +82,6 b' reverse_latex_symbol = { v:k for k,v in latex_symbols.items()}'
 
 fn = Path('..', 'IPython', 'core', 'latex_symbols.py')
 print("Writing the file: %s" % str(fn))
-fn.write_text(s, encoding='utf-8')
+fn.write_text(s, encoding="utf-8")