core: use selected widget from main screen in getWidgetToSwitch: if we are not on "main" screen, selected_widget may not refer to a widget that we want to change. To avoid that, getWidgetToSwitch check and use `_selected_widget_main` if suitable. In other words, a widget from "main" screen will be returned and switched, even if we are on a other screen (e.g. if on "extra", if a widget like ShareWidget is shown).

<intent-filter>
    <action android:name="android.intent.action.SEND" />
    <category android:name="android.intent.category.DEFAULT" />
    <data android:mimeType="*/*" />
</intent-filter>