Centralize timer cleanup

Author: haslinghuis

src/js/msp.js

@@ -480,6 +480,11 @@ const MSP = {
     },
 
     _removeRequestFromCallbacks(requestObj) {
+        // Clear the timer if it exists
+        if (requestObj.timer) {
+            clearTimeout(requestObj.timer);
+        }
+
         const index = this.callbacks.indexOf(requestObj);
         if (index > -1) {
             this.callbacks.splice(index, 1);