[BUGFIX] Use moment.unix for visualizing regular unix timestamps

A dialog trying to prevent overriding existing files in the filelist
module shows an incorrect modification date of files that are existing
on the server-side. When using regular unix timestamps (instead of
micro-timestamps), dedicated `moment.unix` function has to be used.

Resolves: #97724
Releases: main, 11.5, 10.4
Change-Id: Ieb5a00aaf87410e9721e39d91b9e0da13a109bc6
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/74816
Tested-by: core-ci <typo3@b13.com>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>

Build/Sources/TypeScript/backend/Resources/Public/TypeScript/DragUploader.ts

@@ -46,7 +46,7 @@ interface UploadedFile {
   // formatted as ddmmyy
   date: string;
 
-  mtime: Date;
+  mtime: number;
   thumbUrl: string;
   type: string;
 }
@@ -362,7 +362,7 @@ class DragUploaderPlugin {
         ),
         $('<td />').html(
           this.askForOverride[i].original.name + ' (' + (DragUploader.fileSizeAsString(this.askForOverride[i].original.size)) + ')' +
-          '<br>' + moment(this.askForOverride[i].original.mtime).format('YYYY-MM-DD HH:mm'),
+          '<br>' + moment.unix(this.askForOverride[i].original.mtime).format('YYYY-MM-DD HH:mm'),
         ),
         $('<td />').html(
           this.askForOverride[i].uploaded.name + ' (' + (DragUploader.fileSizeAsString(this.askForOverride[i].uploaded.size)) + ')' +