Fixed Issue #194 bug that caused some character not to be typable when they were in the first-alternate or second-alternate keyplane

The search_keyplanes_and_enter_char() method in keyboard_helpers.rb was
unable to reach all typable characters due to a bug that caused it to
select the "shift" key repeatedly instead of using the "more" key
followed by the "shift" key to reach the second-alternate keyplane
where the characters are located.