Fix apply_patches() funtion of 3.0 (quilt) format to properly skip auto patch

When quilt was used, it was applying the automatic patch even
when $skip_auto was set to 1. This bug was introduced while fixing
bug #518453 (commit ea1530fe45c8b1ad61d91c0791c53ecf363899bf).

scripts/Dpkg/Source/Package/V3/quilt.pm

@@ -166,8 +166,8 @@ sub apply_patches {
     if (not $self->{'options'}{'without_quilt'}) {
         my %opts;
         $opts{"to_file"} = "/dev/null" if $skip_auto;
-        info(_g("applying all patches with %s"), "quilt push -a -q") unless $skip_auto;
-        $self->run_quilt($dir, ['push', '-a', '-q'],
+        info(_g("applying all patches with %s"), "quilt push -q " . $patches[-1]) unless $skip_auto;
+        $self->run_quilt($dir, ['push', '-q', $patches[-1]],
                          delete_env => ['QUILT_PATCH_OPTS'],
                          wait_child => 1, %opts);
         foreach my $patch (@patches) {