Remove totalfinder-beta (#4950)

Casks/totalfinder-beta.rb

@@ -1,18 +0,0 @@
-cask 'totalfinder-beta' do
-  version '1.7.12'
-  sha256 'f65a507f924295ac881f3960fdbe4aa51958ed2eaa81b7e01511697dbb8577ec'
-
-  url "http://downloads.binaryage.com/TotalFinder-#{version}.dmg"
-  name 'TotalFinder'
-  homepage 'https://totalfinder.binaryage.com/'
-
-  depends_on macos: '>= :mavericks'
-
-  pkg 'TotalFinder.pkg'
-
-  uninstall pkgutil: 'com.binaryage.pkg.totalfinder.app',
-            script:  {
-                       executable: 'TotalFinder Uninstaller.app/Contents/MacOS/TotalFinder Uninstaller',
-                       args:       ['--headless'],
-                     }
-end