Drop build-dependency on dh-autoreconf: not needed with debhelper 10.

debian/control

@@ -4,8 +4,7 @@ Priority: optional
 Maintainer: Debian backupninja maintainers <pkg-backupninja@lists.riseup.net>
 Uploaders: Micah Anderson <micah@riseup.net>, intrigeri <intrigeri@debian.org>
 Build-Depends:
- debhelper (>= 10),
- dh-autoreconf
+ debhelper (>= 10)
 Build-Conflicts: autoconf2.13
 Standards-Version: 4.0.0
 Homepage: https://0xacab.org/riseuplabs/backupninja