Fix memory leak in unit tests (#5597)

src/renderer/components/+add-cluster/add-cluster.tsx

@@ -134,7 +134,7 @@ class NonInjectedAddCluster extends React.Component<Dependencies> {
         {this.allErrors.length > 0 && (
           <>
             <h3>KubeConfig Yaml Validation Errors:</h3>
-            {...this.allErrors.map(error => <div key={error} className="error">{error}</div>)}
+            {this.allErrors.map(error => <div key={error} className="error">{error}</div>)}
           </>
         )}
         <div className="actions-panel">