fix: 任务栏飞行模式窗口字体太小

与任务栏无线网络中字体保持一致，pixel size 17

Log: 调整字体
Influence: 任务栏飞行模式字体大小
Task: https://pms.uniontech.com/bug-view-148967.html
Change-Id: I583fddfa463faf8b8d85f41fc808a37a2e132408

plugins/airplane-mode/airplanemodeapplet.cpp

@@ -38,6 +38,9 @@ AirplaneModeApplet::AirplaneModeApplet(QWidget *parent)
     setFixedHeight(40);
     QLabel *title = new QLabel(this);
     title->setText(tr("Airplane Mode"));
+    QFont font;
+    font.setPixelSize(17);
+    title->setFont(font);
     QHBoxLayout *appletlayout = new QHBoxLayout(this);
     appletlayout->setMargin(0);
     appletlayout->setSpacing(0);