rm team-number test use of opencoarrays module

"use opencoarrays, only : team_number" is no longer needed now
that the Sourcery Institute GCC fork's teams branch supports
the Fortran 2018 team_number() intrinsic function.

Author: Damian Rouson

src/tests/unit/teams/team-number.f90

@@ -32,9 +32,6 @@ program main
   use iso_fortran_env, only : team_type
   use iso_c_binding, only : c_loc
 
-  use opencoarrays, only : team_number
-    !! TODO: remove the above line below after the compiler supports team_number
-
   implicit none
 
   integer, parameter :: standard_initial_value=-1