Enatega Customer Application: Also remove the heading Default category from restaurant details card

Describe the bug
Remove the heading Default category from restaurant details card showing up on discovery screen. In case If there is no food category selected show blank on the restaurant card.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Enatega Customer Application'.
2. Now see on Discovery page , the restaurant cards right below the restaurant name there is the heading Default Food Category when no food category is selected by the user.

Expected behavior
If a food category is selected for a restaurant, it should display the selected category on the restaurant card.
If no food category is selected, the category heading should be blank or not shown at all (depending on design guidelines).

Smartphone (please complete the following information):

• Device: [e.g. Infinix Hot 50]
• OS: [e.g.Android]
• Browser [e.g. Application]
• Version [e.g. Latest]

Start by running the Enatega Customer Application and inspecting the restaurant details card on the Discovery screen. Reproduce the case where no food category is selected, then trace the card's category display logic. Done means selected categories still appear, while the Default Food Category heading is absent or blank when no category is configured.