Fixed Group admins can be promoted to Group admin again

[Dadparvar]

Right.

Current role of user should be grayed and disabled to make it clear that the user already has that role.

 

[alfa1]

Current role of user should be grayed and disabled to make it clear that the user already has that role.

DadparvarPlease implement this.

 

[Truonglv]

Okey. I have found the issues of this problem. Fixed now.