Fix style issues in app recipes

Fix style issues in app recipes

Update spacing and variable ordering in the demo app recipes for
consistency per the OpenEmbedded syle guide (see:
https://www.openembedded.org/wiki/Styleguide).  Additionally,
a common cut-and-pasted unnecessary comment has been removed from
the recipes.  There are no functional changes.

Bug-AGL: SPEC-3748

Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: Ic7cf3a1392678e76e8f512acb4f16b623fa35d3f