[Releng] promotion script fix

Change-Id: Ib0ecf36a329c63ee19cd55dc9be8b7448caeb401
diff --git a/org.eclipse.epp.mpc.site/promote/promote.sh b/org.eclipse.epp.mpc.site/promote/promote.sh
index 9facf27..f600f5c 100755
--- a/org.eclipse.epp.mpc.site/promote/promote.sh
+++ b/org.eclipse.epp.mpc.site/promote/promote.sh
@@ -101,14 +101,14 @@
     org.eclipse.equinox.internal.p2.artifact.repository.CompositeArtifactRepository \
     "$NAME" \
     "$TIMESTAMP" \
-    "$DIRS"
+    $DIRS
 
   compose compositeContent.xml \
     compositeMetadataRepository \
     org.eclipse.equinox.internal.p2.metadata.repository.CompositeMetadataRepository \
     "$NAME" \
     "$TIMESTAMP" \
-    "$DIRS"
+    $DIRS
 
 }