[Internal] [Bug] Change age to host_age in metadata template

[jessicarowell]

What is the Bug Related To? Please Provide a Description. 
Check the metadata template and update the column values:

• sex -> host_sex
• age -> host_age
• make sure gff_path is there
• check for additional 'description' cell and remove, if present

Place an ❌ in a Box that Best Matches the Bug's Importance:

• [] 1 - Most severe (a full-break in core function)
• [] 2-4 - Moderate (break for a particular aspect/feature) (how integral is the broken feature?)
• 5 - Least severe (non-functional issue, such as inconsitency / error in documentation or administrative in nature) 

Please Complete the Following Information:

• OS: [e.g. iOS]:
• Browser [e.g. chrome, safari]:
• Version [e.g. 22]:
• Run environment (container, cloud service, HPC, platform, etc.):

Please Outline Necessary Steps to Replicate Bug (Go to.. Click on... Install the following... etc.):

Any Additional Context or Information? Has There Been Any Progress Made So Far Towards this Request? Any Concrete Instructions to Resolve the Bug or Helpful Resources to Reference? Screenshots or Logs?

[jessicarowell]

fixed on commit #cac359b