Delete unused string

Signed-off-by: Álvaro Brey Vilas <alvaro.brey@nextcloud.com>

src/main/res/values/strings.xml

@@ -974,7 +974,6 @@
     <string name="no_share_permission_selected">Please select at least one permission to share.</string>
     <string name="share_copy_link">Share &amp; Copy Link</string>
     <string name="set_note">Set Note</string>
-    <string name="share_open_in">Open in…</string>
     <string name="share_send_new_email">Send new email</string>
     <string name="link_name">Link Name</string>
     <string name="delete_link">Delete Link</string>