test: Assert multi-arch in the chroot

The host system might not have a dpkg installed, which makes
dpkg fail with:

  dpkg not recorded as installed, cannot check for multi-arch support!

That's entirely useless of course. We want to know if dpkg could
support multi-arch in our chroot, so we pseudo-install dpkg into
the chroot and pretend it's version is one version higher than
the minimum dpkg version, so dpkg --assert-multi-arch works on
recent dpkgs.

Gbp-Dch: ignore

test/integration/framework

@@ -531,7 +531,7 @@ configdpkg() {
 			insertinstalledpackage 'dpkg' "all" '1.16.2+fake'
 		fi
 	fi
-	if command dpkg --assert-multi-arch >/dev/null 2>&1 ; then
+	if dpkg --assert-multi-arch >/dev/null 2>&1 ; then
 		local ARCHS="$(getarchitectures)"
 		local DPKGARCH="$(dpkg --print-architecture)"
 		# this ensures that even if multi-arch isn't active in the view