cool#8648 clipboard: fix mobile/writer/track_changes_spec.js

To work even if we don't automatically fetch HTML when a text selection
is created.

Signed-off-by: Miklos Vajna <vmiklos@collabora.com>
Change-Id: If9371a3d235a0ee6c006be72dabe40242fa46b2b

cypress_test/integration_tests/mobile/writer/track_changes_spec.js

@@ -59,6 +59,7 @@ describe(['tagmobile', 'tagnextcloud', 'tagproxy'], 'Track Changes', function()
 	});
 
 	it('Reject All',function() {
+		helper.setDummyClipboardForCopy();
 		helper.typeIntoDocument('Hello World');
 		cy.wait(1000);
 		enableRecord();
@@ -69,6 +70,7 @@ describe(['tagmobile', 'tagnextcloud', 'tagproxy'], 'Track Changes', function()
 		confirmChange('Reject All');
 		cy.cGet('.leaflet-layer').click();
 		helper.selectAllText();
+		helper.copy();
 		helper.expectTextForClipboard('Hello World');
 	});
 });