Update milestones.tmpl (go-gitea#34184)

(cherry picked from commit 5015992)

Author: kerwin612

templates/user/dashboard/milestones.tmpl

@@ -114,7 +114,7 @@
 											{{ctx.Locale.Tr "repo.milestones.closed" $closedDate}}
 										{{else}}
 											{{if .DeadlineString}}
-												<span{{if .IsOverdue}} class="text red"{{end}}>
+												<span class="flex-text-inline {{if .IsOverdue}}text red{{end}}">
 													{{svg "octicon-calendar" 14}}
 													{{DateUtils.AbsoluteShort (.DeadlineString|DateUtils.ParseLegacy)}}
 												</span>