Remove unnecessary result in line shaping (#30721)

Updates #29879

Release Notes:

- N/A

crates/editor/src/display_map.rs

@@ -1026,9 +1026,7 @@ impl DisplaySnapshot {
         }
 
         let font_size = editor_style.text.font_size.to_pixels(*rem_size);
-        text_system
-            .layout_line(&line, font_size, &runs)
-            .expect("we expect the font to be loaded because it's rendered by the editor")
+        text_system.layout_line(&line, font_size, &runs)
     }
 
     pub fn x_for_display_point(