Remove unnecessary notistacks and dead terminal enable/disable code

- Remove 'Artikel angelegt.' snackbar from NewArticleTile
- Remove 'Kategorie angelegt.' snackbar from NewCategoryTile
- Remove dead handleEnableAllCategories method and binding from CompanySettingsDialog

src/components/category/NewCategoryTile.jsx

@@ -1,6 +1,5 @@
 import { Component } from 'react';
 import { connect } from 'react-redux';
-import { enqueueSnackbar } from 'notistack';
 import { ActionTile } from '../tiles';
 import { createCategory as createCategoryThunk } from '../../store/categorySlice';
 import CategoryNameDialog from './CategoryNameDialog';
@@ -25,7 +24,6 @@ class NewCategoryTile extends Component {
   async handleSubmit({ name }) {
     const { parentId } = this.props;
     await this.props.createCategory({ parentId, name }).unwrap();
-    enqueueSnackbar('Kategorie angelegt.', { variant: 'success' });
   }
 
   render() {