correctly display filename in MimeComponents

(previously it would include the caption text and save with it as
filename)
Don't append filename to the caption.

Relevant spec: https://spec.matrix.org/latest/client-server-api/#mfile

src/timeline/ReplyMessageComponentChooser.qml

@@ -69,13 +69,12 @@ DelegateChooser {
     DelegateChoice {
         roleValue: MessageComponentType.Video
         delegate: MimeComponent {
-            required property string display
             required property var mediaInfo
             
             mimeIconSource: mediaInfo.mimeIcon
             size: mediaInfo.size
             duration: mediaInfo.duration
-            label: display
+            label: mediaInfo.filename
         }
     }
 
@@ -116,7 +115,7 @@ DelegateChooser {
             mimeIconSource: mediaInfo.mimeIcon
             size: mediaInfo.size
             duration: mediaInfo.duration
-            label: display
+            label: mediaInfo.filename
         }
     }
 
@@ -128,7 +127,7 @@ DelegateChooser {
 
             mimeIconSource: mediaInfo.mimeIcon
             size: mediaInfo.size
-            label: display
+            label: mediaInfo.filename
         }
     }