[BUG] Multiple modals should not be open at the same time

[xelaint]

:bug: Bug report

Current Behavior

Multiple modals are able to be opened at the same time.

Expected Behavior

Only one modal should be open at a time.

Minimal reproduction of the problem with instructions

What is the motivation / use case for changing the behavior?

Better user experience

Environment

Daffodil version: X.Y.Z
Angular version: X.Y.Z 

 
For Tooling issues:
- Node version: XX  
- Platform:  

Others:

[mzrokz]

@xelaint Should an already opened modal get closed if a new modal is opened ?

[damienwebdev]

@mzrokz sorry for the delayed reply, but yes.