ASXL1 Mutations at Diagnosis Did Not Impact on the Depth of Molecular Response (MR) and on Treatment-Free Remission (TFR) Eligibility in Chronic Phase (CP) Chronic Myeloid Leukemia (CML) Patients (pts) Receiving either Nilotinib (NIL) First-Line or Imatinib (IM) with Early Switch to NIL in Case of No Optimal Response in the SUSTRENIM Clinical Trial