CI: autofix rust code.

src/compare/diff.rs

@@ -1,7 +1,5 @@
 use super::util::assert_bounds;
 use super::util::assert_name;
-use crate::parser::Subscript;
-use crate::parser::Superscript;
 use crate::parser::sexp::Token;
 use crate::parser::AngleLink;
 use crate::parser::Bold;
@@ -50,6 +48,8 @@ use crate::parser::Section;
 use crate::parser::SrcBlock;
 use crate::parser::StatisticsCookie;
 use crate::parser::StrikeThrough;
+use crate::parser::Subscript;
+use crate::parser::Superscript;
 use crate::parser::Table;
 use crate::parser::TableCell;
 use crate::parser::TableRow;