common.mk: remove Gallery3D from PRODUCT_PACKAGES

As part of generally removing Gallery apps from the build (at least
one of them is misbehaving, and we don't need any of them.)

Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
diff --git a/common.mk b/common.mk
index debdd79..dd1fb68 100644
--- a/common.mk
+++ b/common.mk
@@ -21,7 +21,6 @@
     CertInstaller \
     DrmProvider \
     Email \
-    Gallery3D \
     LatinIME \
     Launcher2 \
     linaro.android \