Fixes flex property of package tags in smaller screen sizes

What does this MR do and why?

Fixes flex property of package tags in smaller screen sizes introduced in !94050 (merged)

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. In rails console run

     project = Project.find(<project_id>)
     FactoryBot.create(:npm_package, :with_build, project: project).tap { |pkg| 10.times.each { |i| FactoryBot.create(:packages_tag, package: pkg, name: "bananas_#{i}") } }

   Note that the command above may fail during the creation of the files, if this is the case the solution is to copy and paste this snippet inside the rails console:

     def fixture_file_upload(*args, **kwargs)
       Rack::Test::UploadedFile.new(*args, **kwargs)
     end

2. Visit the project package registry.
3. Click on the created package
4. Confirm the tags are shown properly in smaller screen sizes.

MR acceptance checklist

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• I have evaluated the MR acceptance checklist for this MR.