daemon/lua: bad multiplier for GB

daemon/lua/sandbox.lua

 -- Units
 kB = 1024
-MB = 1024*1024
-GB = 1024*1024
+MB = 1024*kB
+GB = 1024*MB
 -- Time
 sec = 1000
 minute = 60 * sec
@@ -146,4 +146,4 @@ function table_print (tt, indent, done)
 	else
 		io.write(tostring(tt) .. "\n")
 	end
-end
\ No newline at end of file
+end