fix missing / in stockpiles

Author: ab9rf

plugins/lua/stockpiles.lua

@@ -8,7 +8,7 @@ local overlay = require('plugins.overlay')
 local widgets = require('gui.widgets')
 
 local STOCKPILES_DIR = 'dfhack-config/stockpiles'
-local STOCKPILES_LIBRARY_DIR = dfhack.getHackPath() .. 'data/stockpiles'
+local STOCKPILES_LIBRARY_DIR = dfhack.getHackPath() .. '/data/stockpiles'
 
 local BAD_FILENAME_REGEX = '[^%w._]'