fix: 任务栏飞行模式显示框左侧边距调整

调整UI显示，与蓝牙边距保持一致

Log: UI显示
Influence: 飞行模式UI
Task: https://pms.uniontech.com/bug-view-148445.html
Change-Id: Iafa820c81591a7912db13bb1b0ba02ee87c8e65e

plugins/airplane-mode/airplanemodeapplet.cpp

@@ -46,6 +46,7 @@ AirplaneModeApplet::AirplaneModeApplet(QWidget *parent)
     appletlayout->addStretch();
     appletlayout->addWidget(m_switchBtn);
     appletlayout->addSpacing(0);
+    appletlayout->setContentsMargins(20, 0, 6, 0);
     setLayout(appletlayout);
     connect(m_switchBtn, &DSwitchButton::checkedChanged, this, &AirplaneModeApplet::enableChanged);
 }