fix: set HTTP_PATH if it already has origin remote

[sh1nj1]

This PR fixes uninitialized HTTP_PATH when it already has origin github remote url.

Error message:

Would you like to add a 'Deploy to Heroku' button to your project. [Y/n]

Adding a 'Deploy to Heroku' button.
/Users/me/project/me/bullet_train/bin/configure-scripts/deploy_button_heroku.rb:13:in '<top (required)>': uninitialized constant HTTP_PATH (NameError)

    HTTP_PATH
    ^^^^^^^^^
        from /Users/me/.local/share/mise/installs/ruby/3.4.1/lib/ruby/3.4.0/bundled_gems.rb:82:in 'Kernel.require'
        from /Users/me/.local/share/mise/installs/ruby/3.4.1/lib/ruby/3.4.0/bundled_gems.rb:82:in 'block (2 levels) in Kernel#replace_require'
        from ./bin/configure:22:in '<main>'