Fix brittleness test

assets/src/brittleness/RationalAdd.dfy.expect

@@ -1,4 +1,4 @@
-RationalAdd.dfy(4,4): Warning: /!\ No terms found to trigger on.
+RationalAdd.dfy(4,4): Warning: Could not find a trigger for this quantifier. Without a trigger, the quantifier may cause brittle verification. To silence this warning, add an explicit trigger using the {:trigger} attribute. For more information, see the section quantifier instantiation rules in the reference manual.
  |
 4 | exists n: int, m: int :: m > 0 && x == (n as real) / (m as real)
  | ^^^^^^
@@ -16,12 +16,12 @@ RationalAdd.dfy(17,12): Related location: this is the postcondition that could n
 RationalAdd.dfy(42,11): Error: assertion might not hold
  |
 42 | assert (x1 as real) / (x2 as real) == ((x1 * y2) as real) / ((x2 * y2) as real);
- |  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 RationalAdd.dfy(43,11): Error: assertion might not hold
  |
 43 | assert r == (((x1 * y2) + (y1 * x2)) as real) / (final_d as real);
- |  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 
 Dafny program verifier finished with 9 verified, 3 errors