scripts/feeds: fix install of packages with different source/binary names

The logic for choice between source and binary packages was reversed.

Fixes: 52719c2b67 "metadata: scripts/feeds: distinguish between source
and binary packages, resolve virtual dependencies"
Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>

scripts/feeds

@@ -580,7 +580,7 @@ sub install_target_or_package {
 	};
 
 	my $this_feed_src = lookup_src($feed, $name);
-	$this_feed_src or do {
+	$this_feed_src and do {
 		return install_src($this_feed_src, $name, $force);
 	};