Update Collabora screenshots

Signed-off-by: Marius Blüm <marius@lineone.io>(cherry picked from commit b320276ee1)
Signed-off-by: Andras Timar <andras.timar@collabora.com>

appinfo/info.xml

@@ -22,7 +22,6 @@
 		<prevent_group_restriction/>
 	</types>
 	<screenshot>https://nextcloud.com/wp-content/themes/next/assets/img/features/collabora-document.png</screenshot>
-	<screenshot>https://nextcloud.com/wp-content/themes/next/assets/img/features/collabora-app.png</screenshot>
 	<screenshot>https://nextcloud.com/wp-content/themes/next/assets/img/features/collabora-presentation.png</screenshot>
 	<screenshot>https://nextcloud.com/wp-content/themes/next/assets/img/features/collabora-spreadsheet.png</screenshot>
 	<settings>