compose: Remove old style compose send disable.

We now use `disabled-message-send-controls` class to control
the disabled status of send button. So, this is not required.

(cherry picked from commit ad0b616bbd)

web/src/compose_setup.js

@@ -40,7 +40,6 @@ import * as user_topics from "./user_topics.ts";
 import * as widget_modal from "./widget_modal.ts";
 
 export function abort_xhr() {
-    $("#compose-send-button").prop("disabled", false);
     upload.compose_upload_cancel();
 }
 

web/src/compose_validate.ts

@@ -718,8 +718,6 @@ export function validate_stream_message_mentions(opts: StreamWildcardOptions): b
 
         if (!user_acknowledged_stream_wildcard) {
             show_stream_wildcard_warnings(opts);
-
-            $("#compose-send-button").prop("disabled", false);
             compose_ui.hide_compose_spinner();
             return false;
         }

web/tests/compose_validate.test.cjs

@@ -155,7 +155,6 @@ function stub_message_row($textarea) {
 function initialize_pm_pill(mock_template) {
     $.clear_all_elements();
 
-    $("#compose-send-button").prop("disabled", false);
     $("#compose-send-button").trigger("focus");
     $("#compose-send-button .loader").hide();
 
@@ -303,7 +302,6 @@ test_ui("validate", ({mock_template, override}) => {
     };
     assert.ok(!compose_validate.validate());
     assert.ok(!$("#compose-send-button .loader").visible());
-    assert.equal($("#compose-send-button").prop("disabled"), false);
     compose_validate.validate();
 
     // Now add content to compose, and expect to see the banner.
@@ -455,7 +453,6 @@ test_ui("validate_stream_message", ({override, override_rewire, mock_template})
     override(realm, "realm_can_mention_many_users_group", everyone.id);
     compose_state.message_content("Hey @**all**");
     assert.ok(!compose_validate.validate());
-    assert.equal($("#compose-send-button").prop("disabled"), false);
     assert.ok(stream_wildcard_warning_rendered);
 
     let wildcards_not_allowed_rendered = false;

web/tests/upload.test.cjs

@@ -152,8 +152,6 @@ test("show_error_message", ({mock_template}) => {
         return "<banner-stub>";
     });
 
-    $("#compose-send-button").prop("disabled", true);
-
     upload.show_error_message(upload.compose_config, "Error message");
     assert.ok(!$("#compose-send-button").hasClass("disabled-message-send-controls"));
     assert.ok(banner_shown);