slapos_subscription_request: fixup! Remove the leading space in the XML

The leading spaces in the XML will lead the XML to become invalid

master/bt5/slapos_subscription_request/SkinTemplateItem/portal_skins/slapos_subscription_request/SubscriptionCondition_renderKVMClusterParameter.py

@@ -32,8 +32,7 @@ for i in range(amount):
   else:
     json_parameter["kvm-partition-dict"]["KVM" + str(i)] = KVM0
 
-xml_parameter = """
-  <?xml version="1.0" encoding="utf-8"?>
+xml_parameter = """<?xml version="1.0" encoding="utf-8"?>
 <instance>
     <parameter id="_">%s</parameter>
 </instance>""" % json.dumps(json_parameter, indent=2)