make OTHER license a valid SPDX expression

### Description

Some licenses in definition data are identified as `OTHER`. This is not a valid SPDX expression. Instead, set the license to `LicenseRef-clearlydefined-OTHER`.

I am assuming this happens in the service during the creation and caching of the summary definition for a set of coordinates. If this is correct, then existing data will need to be updated from `OTHER` to `LicenseRef-clearlydefined-OTHER`.