fix Preferencesbackend binding problem

[hzheng-ledger]

No description provided.

[gre]

what is the context of this PR? is there a LLC task attached? thanks

[hzheng-ledger]

It fixes compile error. A compile error was found be @gagbo
Basically, we've updated some preferences related binding on the libcore side. we should also update some corresponding stuff on node side.
All changes in this PR are auto generated.
The related PR on lib core : LedgerHQ/lib-ledger-core#665

[hzheng-ledger]

More detail related to the compile error:
we've changed NJSPreferencebackendCpp into NJSPreferencebackend
if we launch the auto generate binding script on libcore side. It copies NJSPreferencebackend to the src folder
It has both NJSPreferencebackendCpp.cpp and NJSPreferencebackend.cpp and these two files contains same class and it causes an error
So the NJSPreferencebackendCpp.cpp should be removed

[hzheng-ledger]

but if you don't need to use the updated binding from libcore
there is no compile error. what I do in this PR is to update the binding on node side.