[0.5] Open Orders, no search results with "bit"

**Describe the bug**
- The prefix **bit** give me no search results in Open Orders

**To Reproduce**
- When I go to Open Order and use the search box with **bit**

**Expected behavior**
- List all bit assets in Open Orders

**Desktop (please complete the following information):**
- MX-Linux
- BitShares2-light_2.0.190410-rc1_amd64.deb

Start by reproducing the issue from the Open Orders screen with the search prefix "bit", then trace the Open Orders search implementation. Compare the displayed results with the expected list of bit assets; done means the search returns those assets while preserving existing search behavior.

Written by the indexing model from the issue text.