disable PUSCH PTRS even in ulsim

PTRS leads to code shortening, and the current LDPC implementation has issues with that for higher code rate.
Because of this, we have to disable PTRS by default, as we test MCS 28 in CI.

openair1/SIMULATION/NR_PHY/ulsim.c

@@ -507,7 +507,7 @@ int main(int argc, char **argv)
   uint16_t n_rb0 = 25;
   uint16_t n_rb1 = 75;
   uint8_t mcs_table = 0;
-  uint16_t pdu_bit_map = PUSCH_PDU_BITMAP_PUSCH_DATA | PUSCH_PDU_BITMAP_PUSCH_PTRS;
+  uint16_t pdu_bit_map = PUSCH_PDU_BITMAP_PUSCH_DATA; // | PUSCH_PDU_BITMAP_PUSCH_PTRS;
 
   uint8_t length_dmrs = pusch_len1; // [hna] remove dmrs struct
   uint16_t l_prime_mask = get_l_prime(nb_symb_sch, typeB, pusch_dmrs_pos0, length_dmrs);  // [hna] remove dmrs struct