fix A2 paper size definition

Fixes A2 paper size definition for pclm rendering. This
issue caused incorrect scaling when printing to a pclm
printer with A2 paper selected.

Test: Print A2 to a pclm printer
Signed-off-by: Kurtis Schlepp <mopriadevteam@gmail.com>
Change-Id: Id3650ffc609f3e621ed3afc1be3481a6563d7abd