Updated droplab version to webpack version

.eslintignore

app/assets/javascripts/droplab/droplab.js

app/assets/javascripts/droplab/droplab_ajax.js

app/assets/javascripts/droplab/droplab_ajax_filter.js

app/assets/javascripts/droplab/plugins/ajax.js

app/assets/javascripts/droplab/plugins/ajax_filter.js

app/assets/javascripts/droplab/plugins/filter.js

app/assets/javascripts/droplab/plugins/input_setter.js

app/assets/javascripts/filtered_search/dropdown_hint.js

app/assets/javascripts/filtered_search/dropdown_non_user.js

...s/javascripts/filtered_search/filtered_search_dropdown.js

...ts/javascripts/filtered_search/filtered_search_manager.js

app/assets/javascripts/main.js

app/assets/stylesheets/framework/filters.scss

app/views/shared/issuable/_search_bar.html.haml

spec/features/issues/filtered_search/dropdown_hint_spec.rb

spec/features/issues/filtered_search/dropdown_label_spec.rb

spec/features/issues/filtered_search/search_bar_spec.rb