Swap auto scroll lock/unlock icons (microsoft#162264)

Fixes microsoft#162263

Author: mjbvz

src/vs/workbench/contrib/output/browser/output.contribution.ts

@@ -166,10 +166,10 @@ registerAction2(class extends Action2 {
 				group: 'navigation',
 				order: 3,
 			},
-			icon: Codicon.unlock,
+			icon: Codicon.lock,
 			toggled: {
 				condition: CONTEXT_OUTPUT_SCROLL_LOCK,
-				icon: Codicon.lock,
+				icon: Codicon.unlock,
 				tooltip: nls.localize('outputScrollOn', "Turn Auto Scrolling On")
 			}
 		});