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:

Go to 'Enatega Customer Application'.
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).

Screenshots

Screen_Recording_20250127_155156.mp4
Smartphone (please complete the following information):

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

Search the React Native customer application's discovery screen for the restaurant card and the “Default Food Category” text. Verify the card still shows a selected food category, while an unset category leaves the heading blank or hidden according to the app's design.

Written by the indexing model from the issue text.