v8: Fix context snapshot filename
v8: Fix context snapshot filename

https://github.com/nwjs/v8/commit/9c159088a63341e92b9d96135129f1551c39f467

nwjs/nw.js,nwjs/nw.js,nwjs/nw.js,nwjs/nw.js,nwjs/nw.js,nwjs/nw.js