Fixes #4635: Actually remove requesters when removing requesters.

src/main/java/appeng/me/Grid.java

@@ -176,7 +176,6 @@ public class Grid implements IGrid {
         }
 
         gridNode.getGridProxy().gridChanged();
-        // postEventTo( gridNode, networkChanged );
     }
 
     @Override

src/main/java/appeng/me/cache/EnergyGridCache.java

@@ -502,7 +502,7 @@ public class EnergyGridCache implements IEnergyGrid {
     private void removeRequester(IAEPowerStorage requester) {
         Preconditions.checkState(!ongoingInjectOperation,
                 "Cannot modify energy requesters while energy is being injected.");
-        this.requesters.add(requester);
+        this.requesters.remove(requester);
     }
 
     private void addProvider(IAEPowerStorage provider) {