Move pipeline suffix to correct line (#1070)

Author: andystaples

eng/ci/public.yml

@@ -20,7 +20,7 @@ resources:
       ref: refs/tags/release
 
 extends:
-  template: v1/1ES.Unofficial.PipelineTemplate.yml
+  template: v1/1ES.Unofficial.PipelineTemplate.yml@1es
   parameters:
     pool:
       name: 1es-pool-azfunc-public