Fix form validation for readonly inputs and update WPT expectations (#36090)

The HTML specification states that an input element with the `readonly`
attribute must be barred from constraint validation. Our implementation
previously included an extra check (`does_readonly_apply()`) to verify
if `readonly` applies to the input type, which is unnecessary.

This caused three test failures in:
tests/wpt/meta/html/semantics/forms/constraints/form-validation-willValidate.html.ini

- Removed `does_readonly_apply()` as it is not required for validation.
- Removed `tests/wpt/meta/html/semantics/forms/constraints/form-validation-willValidate.html.ini` since the test now passes.

To update the Web Platform Test expectations, see:
https://book.servo.org/hacking/testing.html#updating-web-platform-test-expectations

Fixes servo/servo#36076

Signed-off-by: Emmanuel Elom <elomemmanuel007@gmail.com>

components/script/dom/htmlinputelement.rs

@@ -477,24 +477,6 @@ impl HTMLInputElement {
         textinput.set_content(value);
     }
 
-    fn does_readonly_apply(&self) -> bool {
-        matches!(
-            self.input_type(),
-            InputType::Text |
-                InputType::Search |
-                InputType::Url |
-                InputType::Tel |
-                InputType::Email |
-                InputType::Password |
-                InputType::Date |
-                InputType::Month |
-                InputType::Week |
-                InputType::Time |
-                InputType::DatetimeLocal |
-                InputType::Number
-        )
-    }
-
     fn does_minmaxlength_apply(&self) -> bool {
         matches!(
             self.input_type(),
@@ -2753,7 +2735,7 @@ impl Validatable for HTMLInputElement {
             InputType::Hidden | InputType::Button | InputType::Reset => false,
             _ => {
                 !(self.upcast::<Element>().disabled_state() ||
-                    (self.ReadOnly() && self.does_readonly_apply()) ||
+                    self.ReadOnly() ||
                     is_barred_by_datalist_ancestor(self.upcast()))
             },
         }

tests/wpt/meta/html/semantics/forms/constraints/form-validation-willValidate.html.ini

@@ -1,9 +0,0 @@
-[form-validation-willValidate.html]
-  [[INPUT in COLOR status\] Must be barred from the constraint validation if it is readonly]
-    expected: FAIL
-
-  [[INPUT in FILE status\] Must be barred from the constraint validation if it is readonly]
-    expected: FAIL
-
-  [[INPUT in SUBMIT status\] Must be barred from the constraint validation if it is readonly]
-    expected: FAIL