Fix some issues reported by lintian

Fix some issues reported by lintian

• Bump debhelper from old 12 to 13. (package-uses-old-debhelper-compat-version)
• Update standards version to 4.6.2, no changes needed. (out-of-date-standards-version)
• Avoid explicitly specifying -Wl,--as-needed linker flag. (debian-rules-uses-as-needed-linker-flag)

Debdiff

These changes affect the binary packages:

[The following lists of changes regard files as different if they have different names, permissions or owners.]

Files in second set of .debs but not in first

-rw-r--r--  root/root   /usr/lib/debug/.build-id/52/154a1d6a7300ac4a77390222ae4f65070832ac.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/ff/2a403bee0bae880d48696168c6a4308cb9b81d.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/6d/7f0d398da9841de24884e52f8790c0a751d23f.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/a0/f4a1140d1952f0d63af339a53bc82fa9093df6.debug

No differences were encountered between the control files of package **pgn2web**

Control files of package pgn2web-dbgsym: lines which differ (wdiff format)

• Build-Ids: 6d7f0d398da9841de24884e52f8790c0a751d23f a0f4a1140d1952f0d63af339a53bc82fa9093df6 52154a1d6a7300ac4a77390222ae4f65070832ac ff2a403bee0bae880d48696168c6a4308cb9b81d

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/pgn2web/f396057f-5238-4a6b-9851-f97f5c5bcebe.