Revert "Switch from down ibiblio repository to official site"

This reverts commit 9924270226ca7c997d8220f5191220519e5d9b2a.

roles/netbootxyz/defaults/main.yml

@@ -486,7 +486,7 @@ releases:
   tinycore:
     enabled: true
     menu: linux
-    mirror: http://tinycorelinux.net
+    mirror: http://distro.ibiblio.org/tinycorelinux
     name: Tiny Core Linux
     versions:
     - arch: x86