Properly calculate expanded git diff hunk highlight ranges (#11632)

Closes https://github.com/zed-industries/zed/issues/11576

Release Notes:

- Fixed expanded diff hunks highlighting an extra row as added
([11576](https://github.com/zed-industries/zed/issues/11576))

crates/go_to_line/src/go_to_line.rs

@@ -120,7 +120,7 @@ impl GoToLine {
                 let anchor = snapshot.buffer_snapshot.anchor_before(point);
                 active_editor.clear_row_highlights::<GoToLineRowHighlights>();
                 active_editor.highlight_rows::<GoToLineRowHighlights>(
-                    anchor..anchor,
+                    anchor..=anchor,
                     Some(cx.theme().colors().editor_highlighted_line_background),
                     cx,
                 );