Set pg_setting.pending_restart when pertinent config lines are removed

This changes the behavior of examining the pg_file_settings view after
changing a config option that requires restart.  The user needs to know
that any change of such options does not take effect until a restart,
and this worked correctly if the line is edited without removing it.
However, for the case where the line is removed altogether, the flag
doesn't get set, because a flag was only set in set_config_option, but
that's not called for lines removed.  Repair.

(Ref.: commits 62d16c7fc561 and a486e35706ea)

Author: Álvaro Herrera <[email protected]>
Reviewed-by: Daniel Gustafsson <[email protected]>
Reviewed-by: Tom Lane <[email protected]>
Discussion: https://postgr.es/m/[email protected]

Branch
------
REL_13_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/b8f91d7f926368115c27b978c939174c96df1a5f

Modified Files
--------------
src/backend/utils/misc/guc-file.l | 2 ++
1 file changed, 2 insertions(+)

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