Improve deadline icon location in milestone list page (#26532)

Author: yp05327

templates/repo/issue/milestones.tmpl

@@ -95,7 +95,7 @@
 									{{$.locale.Tr "repo.milestones.closed" $closedDate | Safe}}
 								{{else}}
 									{{if .DeadlineString}}
-										<span{{if .IsOverdue}} class="text red"{{end}}>
+										<span class="flex-text-inline {{if .IsOverdue}}text red{{end}}">
 											{{svg "octicon-calendar" 14}}
 											{{DateTime "short" .DeadlineString}}
 										</span>