This commit format the display_name of sale.order.line,
without context key.
The webclient trigger the name_search with context
key, but display the field without it.
So on task form view, when searching an SO line, user
will see 'SO0001 - my product' in its dropdown, but the
complete SO line description when saving.
This commit proposes, in aggreement with AL and FP, to
a global (and non conditionnal) format, since it seems
task form view is the only one place requiring the SO
line name_get.