[bundler/bundler] Remove unnecessary indirections

These specs are only run on bundler 2, so the compatibility method is
not needed.

https://github.com/bundler/bundler/commit/6cb28e3aeb

spec/bundler/commands/binstubs_spec.rb

@@ -309,7 +309,7 @@ RSpec.describe "bundle binstubs <gem>" do
         gem "rails"
       G
 
-      bundle! "binstubs rack", forgotten_command_line_options([:path, :bin] => "exec")
+      bundle! "binstubs rack", :path => "exec"
       bundle! :install
 
       expect(bundled_app("exec/rails")).to exist

spec/bundler/runtime/executable_spec.rb

@@ -116,7 +116,7 @@ RSpec.describe "Running bin/* commands" do
       gem "activesupport"
     G
 
-    bundle! :install, forgotten_command_line_options([:binstubs, :bin] => "bin")
+    bundle! :install, :binstubs => "bin"
 
     gemfile <<-G
       source "#{file_uri_for(gem_repo1)}"