script: Simplify TextInput::new (#41975)

This constructors takes more arguments than it needs to. The three
arguments removed are almost always the default values. The exception is
in the unit tests. In this change those calls are modified to use
`set_max_length` like is done in the actual script code.

Testing: This is just a simplification of the code, so should be covered
by existing tests.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>

components/script/dom/html/htmltextareaelement.rs

@@ -49,9 +49,7 @@ use crate::dom::validation::{Validatable, is_barred_by_datalist_ancestor};
 use crate::dom::validitystate::{ValidationFlags, ValidityState};
 use crate::dom::virtualmethods::VirtualMethods;
 use crate::script_runtime::CanGc;
-use crate::textinput::{
-    ClipboardEventFlags, IsComposing, KeyReaction, Lines, SelectionDirection, TextInput,
-};
+use crate::textinput::{ClipboardEventFlags, IsComposing, KeyReaction, Lines, TextInput};
 
 #[dom_struct]
 pub(crate) struct HTMLTextAreaElement {
@@ -145,9 +143,6 @@ impl HTMLTextAreaElement {
                     embedder_sender,
                     webview_id: document.webview_id(),
                 },
-                None,
-                None,
-                SelectionDirection::None,
             )),
             value_dirty: Cell::new(false),
             form_owner: Default::default(),