Update test output for nightly

Author: meithecatte

test_suite/ui/multiple_bits.stderr.nightly

@@ -0,0 +1,5 @@
+error: Flags must have exactly one set bit
+ --> $DIR/multiple_bits.rs:5:5
+  |
+5 |     MultipleBits = 6,
+  |     ^^^^^^^^^^^^^^^^

test_suite/ui/multiple_bits_deferred.stderr.nightly

@@ -1,5 +1,5 @@
-error[E0277]: the trait bound `enumflags2::_internal::AssertionFailed: enumflags2::_internal::ExactlyOneBitSet` is not satisfied
- --> $DIR/multiple_bits_deferred.rs:6:5
+error[E0277]: the trait bound `AssertionFailed: ExactlyOneBitSet` is not satisfied
+ --> $DIR/multiple_bits_deferred.rs:7:5
   |
-6 |     Three = THREE,
-  |     ^^^^^^^^^^^^^ the trait `enumflags2::_internal::ExactlyOneBitSet` is not implemented for `enumflags2::_internal::AssertionFailed`
+7 |     Three = THREE,
+  |     ^^^^^^^^^^^^^ the trait `ExactlyOneBitSet` is not implemented for `AssertionFailed`

test_suite/ui/zero_disciminant.stderr.nightly

@@ -0,0 +1,5 @@
+error: Flags must have exactly one set bit
+ --> $DIR/zero_disciminant.rs:4:5
+  |
+4 |     Zero = 0,
+  |     ^^^^^^^^