Locator: Add missing break in switch-case

Lead to the tiny bug that one could not trigger a shortcut "Alt+Escape"
while in the locator input field

Change-Id: I4eb3182588357f8ce0817459b3d20e4bbd87287a
Reviewed-by: David Schulz <david.schulz@theqtcompany.com>

src/plugins/coreplugin/locator/locatorwidget.cpp

@@ -420,6 +420,7 @@ bool LocatorWidget::eventFilter(QObject *obj, QEvent *event)
                 QTimer::singleShot(0, this, &LocatorWidget::setFocusToCurrentMode);
                 return true;
             }
+            break;
         case Qt::Key_Alt:
             if (ke->modifiers() == Qt::AltModifier) {
                 event->accept();