Fix plugin breaking when handling resources

addons/receive-input-in-editor/ReceiveInputInEditorPlugin.cs

@@ -4,7 +4,7 @@ public partial class ReceiveInputInEditorPlugin
 	: EditorPlugin
 {
 	public override bool _Handles(GodotObject obj)
-		=> true;
+		=> obj is Node;
 
 	public override int _Forward3DGuiInput(Camera3D camera, InputEvent ev)
 	{

addons/receive-input-in-editor/ReceiveInputInEditorPlugin.gd

@@ -2,7 +2,7 @@
 extends EditorPlugin
 
 func _handles(obj: Object) -> bool:
-	return true
+	return obj is Node
 
 func _forward_3d_gui_input(camera: Camera3D, event: InputEvent) -> int:
 	var root := EditorInterface.get_edited_scene_root() as Node3D