Disable direction lock for everything but belts

src/js/game/buildings/belt_base.js

@@ -22,6 +22,10 @@ export class MetaBeltBaseBuilding extends MetaBuilding {
         return "#777";
     }
 
+    getHasDirectionLockAvailable() {
+        return true;
+    }
+
     /**
      * @param {GameRoot} root
      * @param {string} variant

src/js/game/buildings/underground_belt.js

@@ -38,6 +38,10 @@ export class MetaUndergroundBeltBuilding extends MetaBuilding {
         return true;
     }
 
+    getHasDirectionLockAvailable() {
+        return true;
+    }
+
     getStayInPlacementMode() {
         return true;
     }