fix(archive): do not disaply add strategy in read-only mode

frontend/src/component/feature/form/strategies-section.jsx

@@ -25,7 +25,11 @@ class StrategiesSectionComponent extends React.Component {
 
         return (
             <div>
+                {this.props.addStrategy ? (
                     <HeaderTitle title="Activation strategies" actions={<AddStrategy {...this.props} />} />
+                ) : (
+                    <span />
+                )}
                 <StrategiesList {...this.props} />
             </div>
         );