* objects: use a different constant for 'R3TR'
The constant rs_c_pgmid_r3tr comes from the package RS which is not
available in pure BASIS systems.
The constant seok_pgmid_r3tr comes from the package SEOK and abapGit is
already using another constants from this package - seok_access_*.
Related to #1826
* objects: replace rs_c_true with abap_true
The constant rs_c_true comes from the package RS which is no available
in pure BASIS systems.
I believe that the constant rs_c_true was used by mistake.
The constant was assigned to a variable which is of the type abap_bool
and the variable is initialized with abap_false.
Related to #1826
