Fixed RPCDeviceList not forwarding suspend() calls.

src/main/java/li/cil/oc2/common/bus/device/rpc/RPCDeviceList.java

@@ -35,6 +35,13 @@ public final class RPCDeviceList implements RPCDevice {
             .collect(Collectors.toList());
     }
 
+    @Override
+    public void suspend() {
+        for (final RPCDevice device : devices) {
+            device.suspend();
+        }
+    }
+
     @Override
     public boolean equals(final Object o) {
         if (this == o) return true;