--shallow-clone doesn't handle projects with both revision & branch

[drumm]

It is common for drush make files to have both branch and revision specified. For example http://cgit.drupalcode.org/panopoly/tree/drupal-org.make

projects[panopoly_magic][version] = 1.x-dev
projects[panopoly_magic][subdir] = panopoly
projects[panopoly_magic][download][type] = git
projects[panopoly_magic][download][revision] = 65cd976
projects[panopoly_magic][download][branch] = 7.x-1.x

When --shallow-clone is on, $checkout_after_clone = FALSE; is set, bypassing the revision handling,

drush/commands/make/make.download.inc

Line 297 in 4e4569f

if (drush_get_option('shallow-clone', FALSE) &&