test(perps): use FULLSCREEN_CHART_BUTTON selector in chart error test

Fix a stale reference to the old templated `${HEADER}-fullscreen-button`
testID; the redesigned fullscreen button lives in the market summary row
under the named FULLSCREEN_CHART_BUTTON selector.

Author: michalconsensys

app/components/UI/Perps/Views/PerpsMarketDetailsView/PerpsMarketDetailsView.test.tsx

@@ -2143,7 +2143,7 @@ describe('PerpsMarketDetailsView', () => {
       await act(async () => {
         fireEvent.press(
           getByTestId(
-            `${PerpsMarketDetailsViewSelectorsIDs.HEADER}-fullscreen-button`,
+            PerpsMarketDetailsViewSelectorsIDs.FULLSCREEN_CHART_BUTTON,
           ),
         );
       });