Add missing @since tags in css.ui.dialogs.ExtendedFilePickerElementIds

...for entities added with 4e825d97 "gpg4libre:
Encrypt with GPG checkbox in SaveAs file dialog, 1st stab" and
38774ce7 "tdf#86739 Option to set image anchor
type in image insert dialog"

Change-Id: Ifa03d7fb143ea8fd4582431e780aa174e2b0f690
Reviewed-on: https://gerrit.libreoffice.org/49477Reviewed-by: Samuel Mehrbrodt <Samuel.Mehrbrodt@cib.de>
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

offapi/com/sun/star/ui/dialogs/ExtendedFilePickerElementIds.idl

@@ -49,9 +49,9 @@ published constants ExtendedFilePickerElementIds
     const short LISTBOX_TEMPLATE_LABEL = 208;
     const short LISTBOX_IMAGE_TEMPLATE_LABEL = 209;
     const short LISTBOX_FILTER_SELECTOR = 210;
-    const short CHECKBOX_GPGENCRYPTION = 211;
-    const short LISTBOX_IMAGE_ANCHOR   = 212;
-    const short LISTBOX_IMAGE_ANCHOR_LABEL = 213;
+    /** @since LibreOffice 6.0 */ const short CHECKBOX_GPGENCRYPTION = 211;
+    /** @since LibreOffice 6.1 */ const short LISTBOX_IMAGE_ANCHOR   = 212;
+    /** @since LibreOffice 6.1 */ const short LISTBOX_IMAGE_ANCHOR_LABEL = 213;
 };