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]

Start in the Enatega Customer Application's Discovery screen and inspect how restaurant cards render the category beneath the restaurant name. Reproduce the case with no food category selected, then verify that a selected category remains visible while the default heading is absent when no category exists.

Written by the indexing model from the issue text.