Activate no-extra-boolean-cast rule of eslint

sao/eslint.config.mjs

@@ -21,7 +21,6 @@ export default [
             },
         },
         rules: {
-            "no-extra-boolean-cast": "off",
             "no-prototype-builtins": "off",
             "no-self-assign": "off",
             "no-unexpected-multiline": "off",

sao/src/view/tree.js

@@ -112,7 +112,7 @@
                 this.view.optionals.push(column);
             }
 
-            if (Boolean(parseInt(attributes.sum || '0', 10))) {
+            if (parseInt(attributes.sum || '0', 10)) {
                 var sum = jQuery('<label/>', {
                     'text': attributes.string,
                 });