Add icons when adding integration (#5500)

* Add icons when adding integration

* Remove margin from search input and put in parent

src/dialogs/config-flow/step-flow-loading.ts

@@ -32,6 +32,9 @@ class StepFlowLoading extends LitElement {
         padding: 50px 100px;
         text-align: center;
       }
+      paper-spinner-lite {
+        margin-top: 16px;
+      }
     `;
   }
 }