All Blacklight ViewComponents with a template should inherit from Blacklight::Component

[barmintor]

Some components were not updated to inherit from Blacklight::Component in 7.x; this confuses installer attempting to override the associated templates during migration.

app/components/blacklight/response/sort_component.rb:    class SortComponent < ViewComponent::Base
app/components/blacklight/response/view_type_component.rb:    class ViewTypeComponent < ViewComponent::Base
app/components/blacklight/response/view_type_button_component.rb:    class ViewTypeButtonComponent < ViewComponent::Base
app/components/blacklight/response/spellcheck_component.rb:    class SpellcheckComponent < ViewComponent::Base
app/components/blacklight/system/flash_message_component.rb:    class FlashMessageComponent < ViewComponent::Base
app/components/blacklight/system/dropdown_component.rb:    class DropdownComponent < ViewComponent::Base
app/components/blacklight/system/modal_component.rb:    class ModalComponent < ViewComponent::Base