TrimGalore download path

Now hosted on github and file structure changed so this file - /genomics/software_tasks/trim_galore.yaml - needs to be updated to:

```
- name: Download Trim Galore! {{version}}
get_url: url="https://github.com/FelixKrueger/TrimGalore/archive/{{version}}.zip" dest={{source_dir}}/trim_galore_v{{version}}.zip

- name: Unzip Trim Galore!
unarchive:
src: "{{source_dir}}/trim_galore_v{{version}}.zip"
dest: "{{software_dir}}"
copy: no
creates: "{{software_dir}}/trim_galore_zip"

- name: Install Trim Galore!
file: src="{{software_dir}}/TrimGalore-{{version}}/trim_galore" dest=/usr/local/bin/trim_galore state=link
```

Update /genomics/software_tasks/trim_galore.yaml using the task block in the issue, starting by inspecting its current download, unzip, and install steps. Done means the file uses the GitHub archive URL and the revised extraction and symlink paths shown in the issue.

Written by the indexing model from the issue text.