Don't set workspace root in workspace-status.cmd

This is not necessary since change I3321f26da.

Change-Id: I50ee5e932c34bbfe66ef8f0714e83145a6c1f865
diff --git a/tools/workspace-status.cmd b/tools/workspace-status.cmd
index 4a3b88e..bc1560d 100644
--- a/tools/workspace-status.cmd
+++ b/tools/workspace-status.cmd
@@ -1,2 +1 @@
 echo STABLE_BUILD_GERRIT_LABEL dev
-echo STABLE_WORKSPACE_ROOT %cd%