Fix Media Browser Sorting by Modification Date (#16734)

### What does it do?
Adds raw, unformatted date data into store for use in sorting.

### Why is it needed?
Some custom formatted date strings can break proper sorting.

### How to test
Open Media Browser and select a folder with several files. When choosing
to sort by Last Modified, files should show in descending order (you can
only check this by selecting each file and taking note of the date in
the right details panel).

### Related issue(s)/PR(s)
Resolves #16731

---------

Co-authored-by: Jason Coward <[email protected]>

Author: smg6511

core/src/Revolution/Processors/Browser/Directory/GetFiles.php

@@ -53,6 +53,7 @@ public function process()
         /** @var modManagerDateFormatter $formatter */
         $formatter = $this->modx->services->get(modManagerDateFormatter::class);
         foreach ($list as $i => $file) {
+            $list[$i]['lastmod_raw'] = $file['lastmod'];
             $list[$i]['lastmod'] = $formatter->formatDateTime($file['lastmod']);
         }
 

manager/assets/modext/modx.jsgrps-min.js

@@ -44,6 +44,7 @@ MODx.browser.View = function(config) {
             ,'cls','url','relativeUrl','fullRelativeUrl','image','original_width','original_height','image_width','image_height','thumb','thumb_width','thumb_height','pathname','pathRelative','ext','disabled','preview'
             ,{name: 'size', type: 'float'}
             ,'lastmod'
+            ,'lastmod_raw'
             ,'menu', 'visibility'
         ]
         ,baseParams: {
@@ -802,7 +803,7 @@ Ext.extend(MODx.browser.Window,Ext.Window,{
                 data : [
                     ['name', _('name')]
                     ,['size', _('file_size')]
-                    ,['lastmod', _('last_modified')]
+                    ,['lastmod_raw', _('last_modified')]
                 ]
             })
             ,listeners: {
@@ -1207,7 +1208,7 @@ Ext.extend(MODx.Media, Ext.Container, {
                 data : [
                     ['name', _('name')]
                     ,['size', _('file_size')]
-                    ,['lastmod', _('last_modified')]
+                    ,['lastmod_raw', _('last_modified')]
                 ]
             })
             ,listeners: {
@@ -1580,7 +1581,7 @@ Ext.extend(MODx.browser.RTE,Ext.Viewport,{
                 data : [
                     ['name', _('name')]
                     ,['size', _('file_size')]
-                    ,['lastmod', _('last_modified')]
+                    ,['lastmod_raw', _('last_modified')]
                 ]
             })
             ,listeners: {