Ruby file type defaults to `.builder` when saving a file in VS Code

[andyw8]

I noticed in VS Code that if you create a new via File -> New File, then set the type to Ruby, when you go to save it the default filename will be Untitled.builder, rather than Untitled.rb.

This is likely because .builder is listed as the first item in packages.json here.

Re-ordering that list to have .rb first will probably fix it.