fix issue with metadata testing

src/maxicode/detector.rs

@@ -432,7 +432,7 @@ fn find_concentric_circles(image: &BitMatrix) -> Option<Vec<Circle>> {
                     // false alarm, go on with the row
                     let new_column = center - radius + (radius / 4);
                     if new_column == current_column {
-                        // this is necessary because sometimes the loop can get 
+                        // this is necessary because sometimes the loop can get
                         // stuck when the result always comes out the same.
                         row += ROW_SCAN_SKIP;
                         break;