Changed black to white for (read) number label on issue list (#8000)

* Changed black color to blue for read number label on issue list page

* Change color to white

templates/repo/issue/list.tmpl

@@ -208,7 +208,7 @@
 						<input type="checkbox" data-issue-id={{.ID}}></input>
 					</div>
 					{{end}}
-					<div class="ui {{if .IsClosed}}{{if .IsPull}}{{if .PullRequest.HasMerged}}purple{{else}}red{{end}}{{else}}red{{end}}{{else}}{{if .IsRead}}black{{else}}green{{end}}{{end}} label">#{{.Index}}</div>
+					<div class="ui {{if .IsClosed}}{{if .IsPull}}{{if .PullRequest.HasMerged}}purple{{else}}red{{end}}{{else}}red{{end}}{{else}}{{if .IsRead}}white{{else}}green{{end}}{{end}} label">#{{.Index}}</div>
 					<a class="title has-emoji" href="{{$.Link}}/{{.Index}}">{{.Title}}</a>
 
                     {{if .IsPull }}