Code Search does not include personal workspaces

Issue Summary

Even if users have access to any personal workspace (outside of their own personal workspace), users will not be able to use the Code Search functionality on those workspaces.
The dropdown to select the workspace on the Code Search page will not show personal workspaces, only shared workspaces and the personal workspace of the currently logged-in user.

Steps to Reproduce

1. Get access to any personal workspace (the workspace that is created automatically under your account when you create it) outside of your own personal workspace
2. Go to Code Search
3. Click on the dropdown to select the workspace - You will be unable to see it there.

Expected Results

All workspaces that the user has access to must show up on code search.

Actual Results

Personal workspaces do not appear on Code Search's dropdown.

Workaround

There are three workarounds here:
1. Click on the search icon. Below the search field, you'll see a magnifying glass symbol followed by "Search for code in <current workspace name>". Click on this line. If your current workspace is personal, it will take you to the search page. By default, the personal workspace is selected from the dropdown, although it may not be listed there due to this bug.
2. Go directly to the following URL, switching the UUID for the UUID of the workspace that you want to search for:

https://bitbucket.org/search?account=%7B<UUID>%7D

3. Move the repositories from the personal workspace to a shared workspace. This will take some work, but it doesn't require the use of any workaround afterwards.