Gerber X2 generator uses deprecated G02 syntax

Hi all,

I know its a minor thing, but the X2 generator uses the old G01/02/03 syntax deprecated in Gerber X2 version 2015.06 being in the same block as D01.

`%TF.GenerationSoftware,KiCad,Pcbnew,(5.1.5-28-g68d644fd)% %TF.CreationDate,2019-12-15T17:36:06+00:00% %TF.ProjectId,Test2,54657374-322e-46b6-9963-61645f706362,rev?% %TF.SameCoordinates,Original% %TF.FileFunction,Copper,L4,Bot*% %TF.FilePolarity,Positive*% %FSLAX46Y46*%

......

X78546356Y-63817611D02* G75* G02X81546356Y-60817611I3000000J0D01* G01* `