BUG: creating package brow6el-main.tar.gz generates unexpected PURL values

**Describe the bug**
Creating a package in DejaCode from https://codeberg.org/janantos/brow6el/archive/main.tar.gz results in unexpected PURL values.

**To Reproduce**
Steps to reproduce the behavior:
1. Go to Packages user list view
2. Click on Add Package
3. enter https://codeberg.org/janantos/brow6el/archive/main.tar.gz and click Add
4. Note that the generated PURL is `pkg:generic/main.tar.gz?download_url=https://codeberg.org/janantos/brow6el/archive/main.tar.gz` even though it correctly generates the Filename field as `brow6el-main.tar.gz` and it correctly records the Download URL.

**Expected behavior**
The Name value in the PURL should be `brow6el-main-tar-gz` rather than `main.tar.gz`

**Context (OS, Browser, Device, etc.):**
DejaCode v5.5.0