fixes default attributes for button_tag
fix accept nil options
fix button tag without options
fix form button
fix indentations
fix content_or_options to be replaced by options and set to nil
cleanup and move extracted method right into the helper
rollback to private method
remove private method and rewrite into more precise notation
Merge pull request #14255 from prikha/master

Fixes #14254 ActionView button_tag helper default options values issue.