Do not show lock icon on repo list for public repos in private org (#11445)

Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: Lauris BH <lauris@nix.lv>

templates/explore/repo_list.tmpl

@@ -15,10 +15,6 @@
 					<span class="middle">{{svg "octicon-repo-forked" 16}}</span>
 				{{else if .IsMirror}}
 					<span class="middle">{{svg "octicon-repo-clone" 16}}</span>
-				{{else if .Owner}}
-					{{if .Owner.Visibility.IsPrivate}}
-					<span class="text gold">{{svg "octicon-lock" 16}}</span>
-					{{end}}
 				{{end}}
 				<div class="ui right metas">
 					{{if .PrimaryLanguage }}