packagegroup-ni-xfce: replace pt-sans with ttf-pt-sans recipe
packagegroup-ni-xfce: replace pt-sans with ttf-pt-sans recipe

The pt-sans recipe was refactored and moved to ttf-pt-sans
to more closely match changes to other TrueType font recipes.
Include the new version in the xfce packagegroup.

Signed-off-by: Ken Sharp <e6c8ad8f54d15df4645e8aaf3f7a209bc3688570@ni.com>

ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt