Remove default Gerrit formula

Change-Id: I229de61f7dd97d5644397ed63bf7ff39a8994315

gerrit.rb

diff --git a/gerrit.rb b/gerrit.rb
deleted file mode 100644
index cf52959..0000000
--- a/gerrit.rb
+++ /dev/null
@@ -1,5 +0,0 @@
-# typed: false
-# frozen_string_literal: true
-
-class Gerrit < GerritAT3110
-end