Remove update_engine from devserver group.

devserver doesn't need update_payload anymore.

BUG=chromium:872441
TEST=none

Change-Id: Ifc9a3e8033d5880e77b4877fab32a41fcfa22c00
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/manifest/+/1816899Tested-by: Amin Hassani <ahassani@chromium.org>
Auto-Submit: Amin Hassani <ahassani@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>

full.xml

@@ -80,8 +80,7 @@ Your sources have been sync'd successfully.
   <project path="src/aosp/system/libsync"
            name="aosp/platform/system/core/libsync" />
   <project path="src/aosp/system/update_engine"
-           name="aosp/platform/system/update_engine"
-           groups="devserver" />
+           name="aosp/platform/system/update_engine" />
   <project path="src/overlays"
            name="chromiumos/overlays/board-overlays"
            groups="minilayout,firmware" />