Revert fix dirty, because it caused Snap build to fail.

Thanks to xet7 !

snapcraft.yaml

@@ -1,6 +1,6 @@
 name: wekan
 version: 0
-version-script: git update-index --refresh && git describe --dirty --tags |  cut -c 2-
+version-script: git describe --dirty --tags |  cut -c 2-
 summary: The open-source kanban
 description: |
    Wekan is an open-source and collaborative kanban board application.