Fix ruby-add-log-current-method after nested class definition

Fix ruby-add-log-current-method after nested class definition

* lisp/progmodes/ruby-mode.el (ruby--add-log-current-indent):
New function.
(ruby-add-log-current-method): Use it.
Check for "class" and "module" indentation to filter out the
definitions which don't include the given position.  Also try to
match "def" only once (for performance), because if the closest
one doesn't include the given position, none will.

* test/lisp/progmodes/ruby-mode-tests.el
(ruby-add-log-current-method-after-inner-class-outside-methods)
(ruby-add-log-current-method-after-inner-class-outside-methods-with-text):
New tests.