libreoffice-still: apply review comments

Signed-off-by: Florian Brandes <florian.brandes@posteo.de>

pkgs/applications/office/libreoffice/xdg-open-brief.patch

@@ -1,13 +0,0 @@
-diff --git a/shell/source/unix/misc/senddoc.sh b/shell/source/unix/misc/senddoc.sh
-index 4519e01f26e2..8985711a2c01 100755
---- a/shell/source/unix/misc/senddoc.sh
-+++ b/shell/source/unix/misc/senddoc.sh
-@@ -393,6 +393,8 @@ case `basename "$MAILER" | sed 's/-.*$//'` in
-             MAILER=/usr/bin/kde-open
-         elif [ -x /usr/bin/xdg-open ] ; then
-             MAILER=/usr/bin/xdg-open
-+        elif type -p xdg-open >/dev/null 2>&1 ; then
-+            MAILER="$(type -p xdg-open)"
-         else
-             echo "Unsupported mail client: `basename $MAILER | sed 's/-.*^//'`"
-             exit 2