Making the boxart the full vertical size

See this section in romlistscene:

#self.boxart_area = pygame.Rect(0, 0, self.info_container.w, int(self.info_container.h * .4))
+		#ian - make the box art fill the vertical area; use config param to set max height %
+		self.boxart_area = pygame.Rect(0, 0, self.info_container.w, self.avail_height)

I'm not sure why the vertical height for the boxart was limited to self.info_container.h * .4 - I made it the entire vertical area (although it later gets scaled and uses the boxart_max_height: 100%) 

Ignore all the other changes.