Switch bmx6 repo

src/freedombone-image-customise

 
 MESH_TEXT_EDITOR='pluma'
 
-BMX6_REPO="https://github.com/bashrc/bmx6"
-BMX6_COMMIT='20db4cf5abc129b8d4d2a341bb9265a92e7c3d50'
+BMX6_REPO="https://github.com/bmx-routing/bmx6"
+BMX6_COMMIT='39dd1f2d99ac5a3fa28e92f8173c15039132e181'
 
 PATH=/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin