etesync-server: use relative path for static_url

Django 3.1 supports relative paths for static_url.
Use it to make it more flexible.
Minor fixes for upgrade:
* ignore-fail-on-non-empty for rmdir /usr/share/etesync-server/etesync_server
* do not stop service (it is stopped already and init file is removed)

Signed-off-by: Peter Stadler <peter.stadler@student.uibk.ac.at>

net/etesync-server/files/81_setup-etesync-server

@@ -1,7 +1,5 @@
 #!/bin/sh
 
-[ "${PKG_UPGRADE}" = "1" ] && /etc/init.d/etesync-server stop
-
 cd /usr/share/etesync-server || exit 1
 
 python3 manage.pyc migrate --noinput || exit 1

net/etesync-server/files/uci.cfg

@@ -1,6 +1,6 @@
 
 config django 'global'
-	option static_url '/etesync/static/' # TODO for django 3.1: "static/"
+	option static_url 'static/'
 	option debug 'false'
 
 config django 'allowed_hosts'