added version check and branch for BWN_DISASMS

[cccs-cw]

idaapi.BWN_DISASMS is moved to ida_kernwin.BWN_DISASM
https://python.docs.hex-rays.com/ida_kernwin#bwn_disasms

Note: for ida_kernwin.BWN_DISASM there is no S at the end as in the current working version, both have the same value ida_kernwin.BWN_DISASM according to the documentation, however if you try to access ida_kernwin.BWN_DISASMS in IDA v9.0 it does not exists.

BWN_DISASM

BWN_DISASM = 27

BWN_DISASMS

BWN_DISASMS = 27

source: https://python.docs.hex-rays.com/ida_kernwin#bwn_disasm

to address this i've added a global constant where the value is set based on the version