Delete file shares through attachments API

Previously the file was deleted in the file structure of the user is not
expected as the file might not only be related to the card.

Signed-off-by: Julius Härtl <jus@bitgrid.net>

tests/psalm-baseline.xml

@@ -193,6 +193,9 @@
       <code>$cardId</code>
     </InvalidScalarArgument>
   </file>
+  <file src="lib/Service/AttachmentService.php">
+    <InvalidCatch occurrences="1"/>
+  </file>
   <file src="lib/Service/BoardService.php">
     <TooManyArguments occurrences="2">
       <code>findAll</code>