Properly generate the hardstatus for stack-screenrc.

Fixes bug 974641.

Change-Id: I56879083c6e9d6711afacb786f5e238ff843f55b
diff --git a/stack.sh b/stack.sh
index c82c296..5401db2 100755
--- a/stack.sh
+++ b/stack.sh
@@ -759,7 +759,7 @@
         # Name the screen session
         echo "sessionname stack" > $SCREENRC
         # Set a reasonable statusbar
-        echo 'hardstatus alwayslastline "$SCREEN_HARDSTATUS"' >> $SCREENRC
+        echo "hardstatus alwayslastline '$SCREEN_HARDSTATUS'" >> $SCREENRC
         echo "screen -t stack bash" >> $SCREENRC
     fi
     # If this service doesn't already exist in the screenrc file