plugins: lua: use the new method call convention
plugins: lua: use the new method call convention

Propagate the new call convention to lua scripts too. So internal
methods are called in the same way as general methods.

Signed-off-by: Yuxuan Shui <7f7e1535bcd10fa942d56a3436533af20f33203f@gmail.com>

yshui/deai,yshui/deai,yshui/deai