Fix some issues reported by lintian

Fix some issues reported by lintian

• Set upstream metadata fields: Repository.
• Remove unnecessary get-orig-source-target. (debian-rules-contains-unnecessary-get-orig-source-target)

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/2c/bc3b99a74e1d77b3d4ccd666b2f0f69bb19dc6.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/8f/7c7b2bee543b84874ee5c8f2e253ca0f3f98af.debug
-rw-r--r--  root/root   /usr/lib/systemd/user/ayatana-indicator-power.service
-rwxr-xr-x  root/root   DEBIAN/postinst
-rwxr-xr-x  root/root   DEBIAN/postrm

Control files of package ayatana-indicator-power: lines which differ (wdiff format)

• Depends: libayatana-common0 (>= 0.9.5), libc6 (>= 2.34), libglib2.0-0 (>= 2.39.4), libnotify4 (>= 0.7.0), dconf-gsettings-backend | gsettings-backend, init-system-helpers (>= 1.52), ayatana-indicator-common (>= 0.8.0), upower | repowerd

Control files of package ayatana-indicator-power-dbgsym: lines which differ (wdiff format)

• Build-Ids: 8f7c7b2bee543b84874ee5c8f2e253ca0f3f98af 2cbc3b99a74e1d77b3d4ccd666b2f0f69bb19dc6

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