Refactor MainWindow::refocus more

Remove the local variable from `MainWindow::refocus` and add whitespace
to the if statement.

src/gui/MainWindow.cpp

@@ -978,12 +978,10 @@ void MainWindow::refocus()
 	const auto gui = getGUI();
 
 	// Attempt to set the focus on the first of these editors that is not hidden...
-	const auto editorParents = std::array{ gui->songEditor()->parentWidget(), gui->patternEditor()->parentWidget(),
-		gui->pianoRoll()->parentWidget(), gui->automationEditor()->parentWidget() };
-
-	for (auto editorParent : editorParents)
+	for (auto editorParent : { gui->songEditor()->parentWidget(), gui->patternEditor()->parentWidget(),
+		gui->pianoRoll()->parentWidget(), gui->automationEditor()->parentWidget() })
 	{
-		if(!editorParent->isHidden())
+		if (!editorParent->isHidden())
 		{
 			editorParent->setFocus();
 			return;