fix sqllab querysearch typeahead permission issue

[youngyjd]

Query search for users only has type ahead for admin role but not alpha role or sql_lab role. This is a permission issue because /users/api/read endpoint is not open to sql_lab users.

            <AsyncSelect
              dataEndpoint="/users/api/read"
              mutator={this.userMutator}
              value={this.state.userId}
              onChange={this.changeUser}
            />

Adding the specific permission to sql_lab role should fix the bug.

[youngyjd]

@mistercrunch @betodealmeida @hughhhh a quick fix for query search permission issue.

[betodealmeida]

Awesome, thanks for fixing this!