Move screen package to debug tarball

This was used a long while back for a console but it's
now only used for occasional debug.

Tested: Verified QEMU booted to ready state and screen
tool not in image. Verfied it is now in debug tarball.

Change-Id: Ifafda64ee2d0cbe0ab2482aa4e83421d5e8ec025
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/recipes-phosphor/packagegroups/packagegroup-obmc-phosphor-debugtools.bb b/recipes-phosphor/packagegroups/packagegroup-obmc-phosphor-debugtools.bb
index 1a6d4b7..7ca6216 100644
--- a/recipes-phosphor/packagegroups/packagegroup-obmc-phosphor-debugtools.bb
+++ b/recipes-phosphor/packagegroups/packagegroup-obmc-phosphor-debugtools.bb
@@ -12,4 +12,5 @@
     phosphor-logging-test \
     lmsensors-sensors \
     tcpdump \
+    screen \
     "