Oberheim OB-X8 fix: name is actually 20 characters

(cherry picked from commit c7872b4)

adaptations/OberheimOBX8.py

@@ -41,7 +41,7 @@ def name_info(message: List[int]) -> Tuple[int, int]:
                              program_data_ids=[SINGLE_PROGRAM, COMBI_PROGRAM],
                              banks=8,
                              patches_per_bank=128,
-                             name_len=13,
+                             name_len=20,
                              name_info_function=name_info,
                              friendlyBankName=bankName
                              ).install(this_module)