Adds divider before dim option

src/webviews/apps/plus/graph/GraphWrapper.tsx

@@ -914,6 +914,7 @@ export function GraphWrapper({
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 										</VSCodeCheckbox>
 									</MenuItem>
+									<MenuDivider></MenuDivider>
 									<MenuItem role="none">
 										<VSCodeCheckbox
 											value="mergeCommits"