Update the expected output for nightly too

Author: meithecatte

test_suite/ui/multiple_bits_deferred.stderr.nightly

@@ -1,10 +1,5 @@
 error[E0277]: the trait bound `enumflags2::_internal::AssertionFailed: enumflags2::_internal::ExactlyOneBitSet` is not satisfied
-   --> $DIR/multiple_bits_deferred.rs:6:5
-    |
-6   |     Three = THREE,
-    |     ^^^^^^^^^^^^^ the trait `enumflags2::_internal::ExactlyOneBitSet` is not implemented for `enumflags2::_internal::AssertionFailed`
-    |
-   ::: $WORKSPACE/src/lib.rs:228:34
-    |
-228 |         where Assertion::Status: ExactlyOneBitSet {}
-    |                                  ---------------- required by this bound in `enumflags2::_internal::assert_exactly_one_bit_set`
+ --> $DIR/multiple_bits_deferred.rs:6:5
+  |
+6 |     Three = THREE,
+  |     ^^^^^^^^^^^^^ the trait `enumflags2::_internal::ExactlyOneBitSet` is not implemented for `enumflags2::_internal::AssertionFailed`