Suggest improvements form saves "Source code location" as a WEB reference instead of PACKAGE

[nikpivkin]

I used the "Suggest improvements for this vulnerability" form on GHSA-xc6g-ggrc-qq4r. The advisory had no source code location, so I set it to https://github.com/apostrophecms/sanitize-html. In the pull request #9631 the form added it as a reference with the WEB type.

+    {
+      "type": "WEB",
+      "url": "https://github.com/apostrophecms/sanitize-html"
+    },

Other advisories keep the source repository as a PACKAGE reference. For example, GHSA-rjqq-98f6-6j3r has the same URL with "type": "PACKAGE".

I expect the form to save the source code location as a PACKAGE reference.