Osmocom_OBS_sync: fix failing on new scmsync tag
The openSUSE OBS instance has added an scmsync tag to their debian 13
meta config:
<scmsync>https://src.opensuse.org/obs/debian#13</scmsync>
This feature is not supported by the stable OBS version yet (they run
current master), and so the sync fails with:
project validation error: 6:0: ERROR: Element project has extra content: scmsync
Remove the tag to fix this.
Change-Id: Ia2d2ce3a2eeda9a0ed7ce7c7de54293081b44f4e
