Wanted Monitor/Unmonitor Selected button fixed (#528)

* the button was not changing based on the filter selection

nor was it properly carrying out its function.

It should now work.

this code was ported from Sonarr:

https://github.com/Sonarr/Sonarr/commit/979fc436ab88be6e0c9a3f1a721eb3b47d85c218

* indents/spaces/formtting

frontend/src/Utilities/pagePopulator.js

@@ -1,17 +1,27 @@
 let currentPopulator = null;
+let currentReasons = [];
 
-export function registerPagePopulator(populator) {
+export function registerPagePopulator(populator, reasons = []) {
   currentPopulator = populator;
+  currentReasons = reasons;
 }
 
 export function unregisterPagePopulator(populator) {
   if (currentPopulator === populator) {
     currentPopulator = null;
+    currentReasons = [];
   }
 }
 
-export function repopulatePage() {
-  if (currentPopulator) {
+export function repopulatePage(reason) {
+  if (!currentPopulator) {
+    return;
+  }
+  if (!reason) {
+    currentPopulator();
+  }
+
+  if (reason && currentReasons.includes(reason)) {
     currentPopulator();
   }
 }