Added column back button to column component by default

app/javascript/gabsocial/features/ui/components/column.js

@@ -2,6 +2,8 @@ import React from 'react';
 import ColumnHeader from './column_header';
 import PropTypes from 'prop-types';
 import { isMobile } from '../../../is_mobile';
+import ColumnBackButton from '../../../components/column_back_button';
+import ColumnBackButtonSlim from '../../../components/column_back_button_slim';
 
 export default class Column extends React.PureComponent {
 
@@ -11,10 +13,11 @@ export default class Column extends React.PureComponent {
     children: PropTypes.node,
     active: PropTypes.bool,
     hideHeadingOnMobile: PropTypes.bool,
+    backBtnSlim: PropTypes.string,
   };
 
   render () {
-    const { heading, icon, children, active, hideHeadingOnMobile } = this.props;
+    const { heading, icon, children, active, hideHeadingOnMobile, backBtnSlim } = this.props;
 
     const showHeading = heading && (!hideHeadingOnMobile || (hideHeadingOnMobile && !isMobile(window.innerWidth)));
 
@@ -22,9 +25,13 @@ export default class Column extends React.PureComponent {
     const header = showHeading && (
       <ColumnHeader icon={icon} active={active} type={heading} columnHeaderId={columnHeaderId} />
     );
+
+    const backBtn = backBtnSlim ? (<ColumnBackButtonSlim/>) : (<ColumnBackButton/>);
+
     return (
       <div role='region' aria-labelledby={columnHeaderId} className='column'>
         {header}
+        {backBtn}
         {children}
       </div>
     );