Fix download folder for Zuk Z1

Change-Id: I2092cf0a5c04f1cabb3854d388a20d38312dcf8a
diff --git a/_devices/zukz1.markdown b/_devices/zukz1.markdown
index 8681854..a59a8e2 100644
--- a/_devices/zukz1.markdown
+++ b/_devices/zukz1.markdown
@@ -2,7 +2,7 @@
 layout: device

 title:  "Zuk Z1"

 codename: ham

-downloadfolder: ham

+downloadfolder: Z1

 supportstatus: Current

 maintainer: juliusssssmiui

 oem: Zuk