Fix more "changed tack" misspellings

lib/convert-worker.js

@@ -636,6 +636,9 @@ function fixMispellings(xml) {
   // https://www.dictionary.com/browse/scot-free
   xml = xml.replace(/scott(?: |-)free/g, "scot-free");
 
+  // https://grammarist.com/idiom/change-tack/
+  xml = xml.replace(/changed tacks/g, "changed tack");
+
   return xml;
 }
 

lib/substitutions.json

@@ -3676,14 +3676,6 @@
     {
       "before": "Night hags",
       "after": "Night Hags"
-    },
-    {
-      "before": "Mannequin changed tacks",
-      "after": "Mannequin changed tack"
-    },
-    {
-      "before": "Rachel had changed tacks",
-      "after": "Rachel had changed tack"
     }
   ],
   "https://parahumans.wordpress.com/2013/08/06/interlude-26a/": [