[Mod] Change futu gateway contract size to 1
[Mod] Change futu gateway contract size to 1

vnpy/vnpy,msincenselee/vnpy,bigdig/vnpy,bigdig/vnpy,bigdig/vnpy,andrewchenshx/vnpy,andrewchenshx/vnpy,bigdig/vnpy,andrewchenshx/vnpy,msincenselee/vnpy,andrewchenshx/vnpy,msincenselee/vnpy,andrewchenshx/vnpy,vnpy/vnpy,msincenselee/vnpy