[fix] redirects in find.xq

`response:redirect-to` does include the scheme and domain which is
a) not needed
b) can be plain wrong for instances behind a proxy

Author: line-o

modules/find.xq

@@ -44,10 +44,14 @@ return
                     $newest-compatible-package/version ! attribute version {.},
                     $newest-compatible-package/@path
                 }
-            else if ($zip) then
-                response:redirect-to(xs:anyURI($abs-public || $xar-filename || ".zip"))
-            else
-                response:redirect-to(xs:anyURI($abs-public || $xar-filename))
+            else if ($zip) then (
+                response:set-status-code(302),
+                response:set-header("Location", $abs-public || $xar-filename || ".zip")
+            )
+            else (
+                response:set-status-code(302),
+                response:set-header("Location", $abs-public || $xar-filename)
+            )
     else 
         (
             response:set-status-code(404),