Remove duplicate backdrop library

src/containers/costume-tab.jsx

@@ -7,12 +7,10 @@ import VM from 'scratch-vm';
 import AssetPanel from '../components/asset-panel/asset-panel.jsx';
 import PaintEditorWrapper from './paint-editor-wrapper.jsx';
 import CostumeLibrary from './costume-library.jsx';
-import BackdropLibrary from './backdrop-library.jsx';
 import {connect} from 'react-redux';
 
 import {
     closeCostumeLibrary,
-    closeBackdropLibrary,
     openCostumeLibrary,
     openBackdropLibrary
 } from '../reducers/modals';
@@ -163,9 +161,7 @@ class CostumeTab extends React.Component {
             onNewLibraryBackdropClick,
             onNewLibraryCostumeClick,
             costumeLibraryVisible,
-            backdropLibraryVisible,
             onRequestCloseCostumeLibrary,
-            onRequestCloseBackdropLibrary,
             ...props
         } = this.props;
 
@@ -234,13 +230,6 @@ class CostumeTab extends React.Component {
                         onRequestClose={onRequestCloseCostumeLibrary}
                     />
                 ) : null}
-                {backdropLibraryVisible ? (
-                    <BackdropLibrary
-                        vm={vm}
-                        onNewBackdrop={this.handleNewCostume}
-                        onRequestClose={onRequestCloseBackdropLibrary}
-                    />
-                ) : null}
             </AssetPanel>
         );
     }
@@ -289,9 +278,6 @@ const mapDispatchToProps = dispatch => ({
         e.preventDefault();
         dispatch(openCostumeLibrary());
     },
-    onRequestCloseBackdropLibrary: () => {
-        dispatch(closeBackdropLibrary());
-    },
     onRequestCloseCostumeLibrary: () => {
         dispatch(closeCostumeLibrary());
     }