back插件兼容子应用关闭，直接finish改为调用onBackPressed方法

ipu-plugin-basic/src/main/java/com/ai/ipu/mobile/plugin/MobileUI.java

@@ -485,7 +485,12 @@ public class MobileUI extends Plugin {
		    
            // add by chengwb3 android子应用回退主应用使用
            if (!mainFlipper.isCanBack()) {
                context.finish();
                context.runOnUiThread(new Runnable() {
					@Override
					public void run() {
						context.onBackPressed();
					}
				});
                return;
            }