Fix "Copy to space" functional test

Could not figure out why this broke, I did not change this flyout.
At any rate, clicking a different part of the radio button fixed
it.

x-pack/test/functional/page_objects/copy_saved_objects_to_space_page.ts

@@ -37,9 +37,9 @@ export function CopySavedObjectsToSpacePageProvider({
       if (!overwrite) {
         const radio = await testSubjects.find('cts-copyModeControl-overwriteRadioGroup');
         // a radio button consists of a div tag that contains an input, a div, and a label
-        // we can't click the input directly, need to go up one level and click the parent div
-        const div = await radio.findByXpath("//div[input[@id='overwriteDisabled']]");
-        await div.click();
+        // we can't click the input directly, need to click the label
+        const label = await radio.findByCssSelector('label[for="overwriteDisabled"]');
+        await label.click();
       }
       await testSubjects.click(`cts-space-selector-row-${destinationSpaceId}`);
     },