Bug: incorrect application of widget_title filter

Hi and thanks for the plugin.

I’ve come across a bug. On line 472 of wordpress-popular-posts.php you use apply_filters on the widget_title, but you don’t include all the arguments for this filter (see https://codex.www.ads-software.com/Plugin_API/Filter_Reference/widget_title), which breaks any other plugin that depends on information in the second or third arguments.

For example, I have a plugin that allows me to wrap the title of any widget in an <a></a> element, but it won’t work without access to the second argument, $instance.