Stamp package version from VERSION during zip builds.

Replace hardcoded Downloader versions with @VERSION@ placeholders and expand them in the Makefile so package.ini, updater.ini, and CURRENT.ini stay in sync.

include/updater/CURRENT.ini

@@ -1,2 +1,2 @@
 [Current]
-omninx_downloader=1.0.1
+omninx_downloader=@VERSION@

include/updater/updater.ini

@@ -1,6 +1,6 @@
 ;title='OmniNX Updater'
 ;creator=NiklasCFW, Woody2408
-;version=1.0.0
+;version=@VERSION@
 ;about='OmniNX Updater'
 
 [@CFW Pack]