feat(files): Allow rewrite css var --row-height from custom theming

Signed-off-by: Tatjana Kaschperko Lindt <[email protected]>

apps/files/src/components/FilesListVirtual.vue

@@ -320,7 +320,7 @@ export default defineComponent({
 
 <style scoped lang="scss">
 .files-list {
-	--row-height: 55px;
+	--row-height: var(--list-row-height, 55px);
 	--cell-margin: 14px;
 
 	--checkbox-padding: calc((var(--row-height) - var(--checkbox-size)) / 2);