fix(editor): Use hasOwnProperty to check for canvas key on connector (no-changelog) (#7921)

## Summary
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Fixes `key in object` check by replacing with `hasOwnProperty`.

## Issues fixed
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ticket**:
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https://linear.app/n8n/issue/N8N-7077/typeerror-cannot-use-in-operator-to-search-for-canvas-in-null

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packages/editor-ui/src/views/NodeView.vue

@@ -2722,7 +2722,7 @@ export default defineComponent({
 						NodeViewUtils.addConnectionTestData(
 							info.source,
 							info.target,
-							'canvas' in info.connection.connector
+							info.connection?.connector?.hasOwnProperty('canvas')
 								? (info.connection.connector.canvas as HTMLElement)
 								: undefined,
 						);