Updates grab-queue: b2a4699 Fix default downloader params

diff --git a/grab-queue b/grab-queue
index 48e5abf6b32991cf1e3da698ca6519e0da9e1e2e..b2a46992d861c361e1925fbe5a76870e88ee6594 160000 (submodule)
--- a/grab-queue
+++ b/grab-queue
@@ -1 +1 @@
-Subproject commit 48e5abf6b32991cf1e3da698ca6519e0da9e1e2e
+Subproject commit b2a46992d861c361e1925fbe5a76870e88ee6594