Fix error 500 when trying to filter a disallowed field on /api/admin/account.get_wallets

[unnawut]

Closes #513

Overview

This PR fixes the issue with filtering a disallowed field on /api/admin/account.get_wallets.

Changes

• Updated Orchestrator.build_query/3 to use with clause instead of pipes to catch errors mid-way.
• Fixed WalletOverlay that should use self_filter_fields() instead of default_preload_assocs() for figuring out the allowed filter fields.

Implementation Details

Because Orchestrator.build_query/3 was using pipes, this makes it hard to handle error if it is returned midway. This PR changed it to use with clauses.

Also, WalletOverlay was using default_preload_assocs() to build the filters instead of self_filter_fields().

Usage

Making a request like following should return the proper results:

curl 10.5.10.10:4000/api/admin/account.get_wallets \
-H "Accept: application/vnd.omisego.v1+json" \
-H "Authorization: OMGAdmin <truncated>" \
-H "Content-Type: application/json" \
-d '{
  "per_page":10,
  "sort_by":"created_at",
  "sort_dir":"desc",
  "id":"acc_01cvven6b8zchchcn3wpsk9h89",
  "owned":false,
  "match_any": [
    {"field":"address","comparator":"contains","value":"asasd"},
    {"field":"account.name","comparator":"contains","value":"asasd"}
  ]
}' \
-v -w "\n" | jq

Impact

No DB or API changes