Adding "close" icon when navbar-toggler is clicked

[antriksh-9]

Is your feature request related to a problem? Please describe.
In mobile view of simulator, a navbar-toggler is present at the top-right corner which when clicked, the icon does not change to "close" icon.

Describe the solution you'd like
Adding a "close" icon, replacing the the default icon navbar-toggler when it is clicked.

Additional context
Solution of the problem:

solution.mp4

Are you working on this? (Yes/No)
Yes