Small tweak to attachmentimg, add data-mimetype so customcsss can be set on them for thumbnail image

views/mixins/catalogtile.pug

@@ -31,7 +31,7 @@ mixin catalogtile(board, post, index)
 					else if file.hasThumb
 						img.catalog-thumb(src=`/file/thumb-${file.hash}${file.thumbextension}` width=file.geometry.thumbwidth height=file.geometry.thumbheight loading='lazy')
 					else if file.attachment
-						div.attachmentimg.catalog-thumb
+						div.attachmentimg.catalog-thumb(data-mimetype=file.mimetype)
 					else if file.mimetype.startsWith('audio')
 						div.audioimg.catalog-thumb
 					else

views/mixins/post.pug

@@ -86,7 +86,7 @@ mixin post(post, truncate, manage=false, globalmanage=false, ban=false)
 									else if file.hasThumb
 										img.file-thumb(src=`/file/thumb-${file.hash}${file.thumbextension}` height=file.geometry.thumbheight width=file.geometry.thumbwidth loading='lazy')
 									else if file.attachment
-										div.attachmentimg.file-thumb
+										div.attachmentimg.file-thumb(data-mimetype=file.mimetype)
 									else if type === 'audio'
 										div.audioimg.file-thumb
 									else