build(packaging/homebrew): Rename class from @PROJECT_NAME@ to Sunshine (#4308)

Author: ReenigneArcher

packaging/sunshine.rb

@@ -1,6 +1,6 @@
 require "language/node"
 
-class @PROJECT_NAME@ < Formula
+class Sunshine < Formula
   # conflicts_with "sunshine", because: "sunshine and sunshine-beta cannot be installed at the same time"
   desc "@PROJECT_DESCRIPTION@"
   homepage "@PROJECT_HOMEPAGE_URL@"