Since commit 360708e93d the feed-latest-build query has returned extra columns in the results, causing log messages like the following:
```
meddler.Targets: column [build_repo_id] not found in struct
meddler.Targets: column [build_id] not found in struct
meddler.WriteTargets: column [build_repo_id] not found in struct
meddler.WriteTargets: column [build_id] not found in struct
```
This is a result of the optimised Postgres query including the `build_repo_id` and `build_id` terms, where previously they were not inclued.
This PR rewrites the query slightly to produce the expected result set (i.e. without the `build_repo_id` and `build_id` columns). As a side-effect it also looks similar to the original query.
Signed-off-by: Niall Sheridan <nsheridan@squarespace.com>
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