fix(js): Revert attempted worker blob optimization

Author: Anton Eriksson

interfaces/js/src/infomap.js

@@ -12,11 +12,11 @@ class Infomap {
 
   _workerId = 0;
   _workers = {};
-  _workerBlob = new Blob([InfomapWorker], { type: "application/javascript" });
 
   initWorkerUrl() {
     if (this._workerUrl) return;
-    this._workerUrl = URL.createObjectURL(this._workerBlob);
+    const blob = new Blob([InfomapWorker], { type: "application/javascript" });
+    this._workerUrl = URL.createObjectURL(blob);
   }
 
   revokeWorkerUrl() {
@@ -99,10 +99,6 @@ class Infomap {
     }
 
     delete this._workers[id];
-
-    if (Object.keys(this._workers).length === 0) {
-      this.revokeWorkerUrl();
-    }
   }
 }