[FIX] project: hide sub-task count in kanban view of task

before this commit,
in kanban view of task sub-task count of task is visible when
sub-task feature is disable from setting.

after this commit,
sub-task count of task will not be visible in kanban view of
task when sub-task feature is disable from setting.

task-2758779

X-original-commit: 1e45586c16443c3a19ae16f604882087dea3cc4e
Part-of: odoo/odoo#89329

addons/project/static/src/js/widgets/project_name_with_subtask_count_widget.js

@@ -18,7 +18,7 @@ export const FieldNameWithSubTaskCount = FieldChar.extend({
 
     _render: function () {
         let result = this._super.apply(this, arguments);
-        if (this.recordData.child_text) {
+        if (this.recordData.allow_subtasks && this.recordData.child_text) {
             this.$el.append($('<span>')
                     .addClass("text-muted ml-2")
                     .text(this.recordData.child_text)