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)
• Set upstream metadata fields: Bug-Database, Bug-Submit, Repository-Browse. (upstream-metadata-file-is-missing, upstream-metadata-missing-bug-tracking)
• 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 (out-of-date-standards-version)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/86/ea9c7b98f68c208d8d22ba0db80606e98a9416.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/09/8454549c888f96a316e258f52274a2fca0235c.debug

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

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

• Build-Ids: 098454549c888f96a316e258f52274a2fca0235c 86ea9c7b98f68c208d8d22ba0db80606e98a9416

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/idevicerestore/cf2ea8b2-a629-4c2c-b940-f1536b6f8fff.