Update uitest stderrs + new test

Signed-off-by: Jonathan Brouwer <jonathantbrouwer@gmail.com>

Author: JonathanBrouwer

tests/ui/attributes/issue-90873.stderr

@@ -1,15 +1,3 @@
-error: attribute value must be a literal
-  --> $DIR/issue-90873.rs:1:6
-   |
-LL | #![u=||{static d=||1;}]
-   |      ^^^^^^^^^^^^^^^^^
-
-error: attribute value must be a literal
-  --> $DIR/issue-90873.rs:6:6
-   |
-LL | #![a={impl std::ops::Neg for i8 {}}]
-   |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
 error: cannot find attribute `u` in this scope
   --> $DIR/issue-90873.rs:1:4
    |
@@ -22,6 +10,18 @@ error: cannot find attribute `a` in this scope
 LL | #![a={impl std::ops::Neg for i8 {}}]
    |    ^
 
+error: attribute value must be a literal
+  --> $DIR/issue-90873.rs:1:6
+   |
+LL | #![u=||{static d=||1;}]
+   |      ^^^^^^^^^^^^^^^^^
+
+error: attribute value must be a literal
+  --> $DIR/issue-90873.rs:6:6
+   |
+LL | #![a={impl std::ops::Neg for i8 {}}]
+   |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
 error[E0601]: `main` function not found in crate `issue_90873`
   --> $DIR/issue-90873.rs:6:37
    |