fix: DLE restore configuration(#230)

Description

fix DLE restore configuration

• add recovery_target_timeline (PG < 12) to handle failovers properly in Postgres 11 and older(see the related issue)
• skip an error due to absent postgresql.conf while init DLE configs. The absence of the postgresql.conf file is normal at the first start because it will be initialized a little later
• correct the path of the recovery file

Related issue

#230 (closed)

Examples

Checklist

• the MR description has been reviewed
• this MR contains text changes and they have been reviewed OR there are no texts changes
• this MR contains GUI/CLI changes and they have been reviewed OR there are no GUI/CLI changes
• this MR contains API changes, specifications reflect those changes and they have been reviewed OR there are no API changes

Closes #230 (closed)