refactor: fix formatting

Author: alxkm

src/main/java/com/thealgorithms/maths/NonRepeatingElement.java

@@ -56,6 +56,6 @@ public static int[] findNonRepeatingElements(int[] arr) {
             }
         }
 
-        return new int[]{num1, num2};
+        return new int[] {num1, num2};
     }
 }