[MM-53333] Modified the delete category modal to contain a cancel button #24290 (#24317)

* Added cancel button in the delete category modal

Co-authored-by: Mattermost Build <build@mattermost.com>

webapp/channels/src/components/delete_category_modal/delete_category_modal.tsx

@@ -40,6 +40,10 @@ export default class DeleteCategoryModal extends React.PureComponent<Props, Stat
         this.props.actions.deleteCategory(this.props.category.id);
     };
 
+    handleCancel = () => {
+        this.props.onExited();
+    };
+
     render() {
         return (
             <GenericModal
@@ -51,6 +55,7 @@ export default class DeleteCategoryModal extends React.PureComponent<Props, Stat
                         defaultMessage='Delete this category?'
                     />
                 )}
+                handleCancel={this.handleCancel}
                 handleConfirm={this.handleConfirm}
                 confirmButtonText={(
                     <FormattedMessage