Fix breadcrumb so that it shouldn't show the `My applications` if on landing page

Very very minor thing:
You also can just set before_action filter and do not add "def" blocks for each page.

Like:
```
before_action :set_landing_page_mode, only: [
   :home,
   :awards_for_organisations,
   :enterprise_promotion_awards,
   :how_to_apply,
   :timeline, 
   :additional_information_and_contact,
   :terms,
   :apply_for_queens_award_for_enterprise
]

private

def set_landing_page_mode
  @is_landing_page = true
end
```