Opt out from having the service name implicitly be concatenated with the account name on windows.

[TheGrandmother]

It would be very very nice to be able to opt out of having the target name become the concatenation of the service name and account name on widows. It makes it impossible to integrate keytar with another application that does not use that naming convention :/

https://github.com/atom/node-keytar/blob/deae59a488789f2cd4a8dba6c7e58665795804fe/src/keytar_win.cc#L120 https://github.com/atom/node-keytar/blob/deae59a488789f2cd4a8dba6c7e58665795804fe/src/keytar_win.cc#L152