sample query: Removed superfluous prefixes

Author: hoijui

res/sample-queries/count-projects.sparql

@@ -2,11 +2,7 @@
 #
 # SPDX-License-Identifier: Unlicense
 
-PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
-PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
-PREFIX ods: <http://w3id.org/oseg/ont/ods#>
 PREFIX okh: <http://w3id.org/oseg/ont/okh#>
-PREFIX otrl: <http://purl.org/oseg/ontologies/OTRL#>
 
 # Count all projects (aka modules)
 SELECT (COUNT(*) AS ?count)