de.pengutronix.rauc.Installer.xml: add missing direction definitions for 'source' argument
de.pengutronix.rauc.Installer.xml: add missing direction definitions for 'source' argument

This adds missing definition of direction for 'source' argument in
'Install' and 'InstallBundle' D-Bus methods.

Signed-off-by: Taras Zaporozhets <78a32987caec6cc488a3fab0b87fffcb293f30f0@gmail.com>

rauc/rauc,jluebbe/rauc,jluebbe/rauc,ejoerns/rauc,jluebbe/rauc,rauc/rauc,ejoerns/rauc,rauc/rauc,ejoerns/rauc