workaround firefox layout bug:

three-line toasts get a scrollbar even if it doesn't need one
and the width is not adjusted correctly when that happens

copyparty/web/ui.css

@@ -69,6 +69,7 @@ html {
 #toastb {
 	max-height: 70vh;
 	overflow-y: auto;
+	padding: 1px;
 }
 #toast.scroll #toastb {
 	overflow-y: scroll;