Visual update only, no additional design assets required

Steps to reproduce

1. Open Wikipedia and enter a search and open and article from the search input
2. Open Search again and note the "Recent searches" shown below the search input bar.

Actual

• "Recent searches" heading is shown in Roboto Bold at 20sp size, which is not used anywhere else in the app
• Recent searches is on the Base background color
• Search results text is shown in font-size ~18sp, which is not used anywhere else in the app
• Search results are not separated by a divider line

Expected

• "Recent searches" heading is in the "Body 2" style used for Material list subheaders, in the Material theme Secondary color (Light = Black@54%)
• Recent searches subheader is on a Paper background color
• Search results text is in the standard font-style for single line items (Roboto Regular 16sp), in the Material theme Primary color (Light = Black@87%)
• there is a 0.5dp divider line in the Material theme borders and rules color (Light = Black@12%)