lyd mods BUGFIX even data with changed context must be stored
lyd mods BUGFIX even data with changed context must be stored

It is not enough to check whether the data changed
because LYB also stores basic module information
in metadata. So if that changed, the data must
certainly be written again.

sysrepo/sysrepo,sysrepo/sysrepo,sysrepo/sysrepo