Fix toggle more actions staying visible, and clickable issues (#3949)

- Fixed so it's now invisible instead of empty when not selected.
 - This fixes clickability and issue where it stayed visible in 1 fix
- Also fixed cell output action which used active cell instead of context cell.

src/sql/parts/notebook/notebook.css

@@ -80,4 +80,7 @@
 .moreActions .action-label.icon.toggle-more {
 	height: 20px;
 	width: 20px;
+}
+.moreActions.actionhidden {
+	visibility: hidden
 }