mpkg: fix too many arguments error for fetch, install and remove.
mpkg: fix too many arguments error for fetch, install and remove.

To have the behavior mentionned in the usage() function.

Signed-off-by: Gaël PORTAY <1666f60cfa201a60b0ea694168a0b6932673170a@gmail.com>

gazoo74/mpkg,gazoo74/mpkg