fix: adjust margin for hr

fixes #1889.

Signed-off-by: Max <[email protected]>

Author: max-nextcloud

css/prosemirror.scss

@@ -147,7 +147,7 @@ div.ProseMirror {
 	hr {
 		padding: 2px 0;
 		border: none;
-		margin: 3em 0;
+		margin: 2em 0;
 		width: 100%;
 	}