server: fix resource count updated unmanage vm (#8169)

Do not decrement resource count for a running VM twice while unmanaging a VM

Author: shwstppr

server/src/main/java/com/cloud/vm/UserVmManagerImpl.java

@@ -8452,9 +8452,7 @@ private void postProcessingUnmanageVM(UserVmVO vm) {
             UsageEventUtils.publishUsageEvent(EventTypes.EVENT_VM_STOP, vm.getAccountId(), vm.getDataCenterId(),
                     vm.getId(), vm.getHostName(), vm.getServiceOfferingId(), vm.getTemplateId(),
                     vm.getHypervisorType().toString(), VirtualMachine.class.getName(), vm.getUuid(), vm.isDisplayVm());
-            resourceCountDecrement(vm.getAccountId(), vm.isDisplayVm(), cpu, ram);
         }
-
         // VM destroy usage event
         UsageEventUtils.publishUsageEvent(EventTypes.EVENT_VM_DESTROY, vm.getAccountId(), vm.getDataCenterId(),
                 vm.getId(), vm.getHostName(), vm.getServiceOfferingId(), vm.getTemplateId(),