Only a User should become Admin

[ofpiyush]

@RocketChat/core

The bug:
The first "user" should be made admin. Instead rocket.cat becomes the admin in new installs.

History:

• This Bug was fixed once in Rocket.Cat Shouldn't be Admin #1647
• It regressed in 6157e77#diff-80879a72bba8e1d0cb43a26400c2041f
• In a recent commit, the files were moved from coffee to js and the bug got carried over.

The Fix
Check type: user before making a user admin.

[CLAassistant]

All committers have signed the CLA.

[ofpiyush]

@dalchand please set your email and sign the cla

[dalchand]

@CLAassistant I have signed the CLA and set the email id as well

[graywolf336]

You guys might need to do this again, as the commit was done with the email address configured as [email protected].

[ofpiyush]

@graywolf336 Thanks for pointing it out. Fixed now :)

[dalchand]

Check if there is an admin of type 'user'