Don't refer to everything as an image in the file context menu

Instead, let's change the text based on the message component type.

src/app/qml/RoomPage.qml

@@ -266,6 +266,7 @@ Kirigami.Page {
                 plainText: plainText,
                 mimeType: mimeType,
                 progressInfo: progressInfo,
+                messageComponentType: messageComponentType,
             });
             contextMenu.popup();
         }