Trim trailing whitespace.

Changes-By: lintian-brush
Fixes: lintian: trailing-whitespace
See-also: https://lintian.debian.org/tags/trailing-whitespace.html

debian/control

@@ -10,4 +10,3 @@ Architecture: any
 Depends: ${shlibs:Depends}, ${misc:Depends}
 Description: ACME server
  Automatically manages and renews public SSL certificates.
-

debian/rules

@@ -15,4 +15,3 @@ override_dh_systemd_enable:
 
 override_dh_systemd_start:
 	dh_systemd_start --no-start
-