Update ui test files

test_suite/tests/ui/with-variant/skip_de_struct_field.stderr

@@ -1,5 +1,5 @@
 error: variant `Struct` cannot have both #[serde(deserialize_with)] and a field `f1` marked with #[serde(skip_deserializing)]
-  --> $DIR/skip_de_struct_field.rs:5:5
+  --> $DIR/tests/ui/with-variant/skip_de_struct_field.rs:5:5
    |
 5  | /     #[serde(deserialize_with = "deserialize_some_other_variant")]
 6  | |     Struct {