TopNavigation's subtitle styling fix

Bug Report

I added a subtitle property to the <TopNavigation/> component, but the subtitle remains on the same line as the title, except I set the alignment to center.

To Reproduce

Steps to reproduce the behavior:

<TopNavigation
          // alignment='center'
          title={`Welcome `}
          subtitle={"How are you doing today"}
          accessoryRight={renderAccessoryRight}
        />

Expected behavior

The title and subtitle should be on different lines.

UI Kitten and Eva version