Downgrade ssb-backlinks to v1.1.0

This bump seems to be causing issues. Which is weird, because it actually
bumps the index number for the backlinks indexes and so will rebuild them.
But that's what my testing shows... `*shrug*`

Author: black-puppydog

package-lock.json

@@ -65,7 +65,7 @@
     "secret-stack": "^6.3.1",
     "sorted-array-functions": "^1.2.0",
     "spacetime": "^6.4.1",
-    "ssb-backlinks": "^2.1.1",
+    "ssb-backlinks": "^1.1.0",
     "ssb-blob-files": "^1.2.0",
     "ssb-blobs": "^2.0.1",
     "ssb-client": "^4.9.0",