Writer: Stylesview: Border should be included in total height

This way we can make sure the Stylesview container doesn't become to
bulky.

Signed-off-by: Pedro Pinto Silva <pedro.silva@collabora.com>
Change-Id: Iad7a2bb2226e99d0840d0aba437f4dcde9bce634

browser/css/notebookbar.css

@@ -394,6 +394,7 @@ html[data-theme='dark'] .savemodified.unotoolbutton .unobutton img {
 	scrollbar-width: none;
 	background-color: var(--color-stylesview-background);
 	filter: brightness(var(--brightness-stylesview));
+	box-sizing: border-box;
 }
 
 #stylesview:hover {