Fix some issues reported by lintian

Fix some issues reported by lintian

• Set upstream metadata fields: Bug-Database, Bug-Submit, Repository. (upstream-metadata-missing-bug-tracking)

• Remove unused license definitions for BSD-3-Clause. (unused-license-paragraph-in-dep5-copyright)

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/fcitx5-anthy/55c3c787-f2e8-4510-bd17-8fef5a23490c.

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/8b/0def1ec2707c4e4dea53101b54281d048afdf8.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/7d/d48a3227cdaed51b4d7ec50118096d66b6158c.debug

No differences were encountered between the control files of package **fcitx5-anthy**

Control files of package fcitx5-anthy-dbgsym: lines which differ (wdiff format)

• Build-Ids: 7dd48a3227cdaed51b4d7ec50118096d66b6158c 8b0def1ec2707c4e4dea53101b54281d048afdf8

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