build: update glide files to point to latest btcd

This commit updates the glide files to point to the latest btcd build
which has had stall detection temporary disabled in order to ensure
smooth neutrino syncs without the false positives currently present in
stall detection.

glide.yaml

@@ -15,7 +15,7 @@ import:
   - proto
 - package: github.com/howeyc/gopass
 - package: github.com/roasbeef/btcd
-  version: 4b411f0e78f1faa96ae650d886170d018c1835bf
+  version: a64d018fd91151b842522d64771610712565d30a
   subpackages:
   - blockchain
   - btcec