Merge pull request #49155 from nextcloud/backport/49153/stable28

Author: skjnldsv

apps/files_sharing/css/public.css

@@ -141,6 +141,11 @@ thead {
 	border-color: rgba(0,0,0,0.3) !important;
 }
 
+// Header note prior 31
+#notemenu .icon-comment-white.menutoggle {
+	filter: var(--background-invert-if-dark);
+}
+
 #public-upload .avatardiv {
 	margin: 0 auto;
 }