fix: remove default button class configuration in SimpleForm setup

Author: rrg1459

config/initializers/simple_form_bootstrap.rb

@@ -15,7 +15,6 @@
 # Use this setup block to configure all options available in SimpleForm.
 SimpleForm.setup do |config|
   # Default class for buttons
-  # config.button_class = 'btn btn-default'
 
   # Define the default class of the input wrapper of the boolean input.
   config.boolean_label_class = 'form-check-label'