fix: screenShot

1. 隐藏未实现的功能
2. 截屏功能直接将一帧视频帧保存为jpg即可，不在controller中实现

QtScrcpy/device/controller/controller.cpp

@@ -169,12 +169,6 @@ void Controller::setScreenPowerMode(ControlMsg::ScreenPowerMode mode)
     postControlMsg(controlMsg);
 }
 
-void Controller::screenShot()
-{
-    // TODO:
-    qDebug() << "screen shot";
-}
-
 void Controller::mouseEvent(const QMouseEvent *from, const QSize &frameSize, const QSize &showSize)
 {
     if (m_inputConvert) {

QtScrcpy/device/controller/controller.h

@@ -38,7 +38,6 @@ public:
     void clipboardPaste();
     void postTextInput(QString& text);
     void setScreenPowerMode(ControlMsg::ScreenPowerMode mode);
-    void screenShot();
 
     // for input convert
     void mouseEvent(const QMouseEvent* from, const QSize& frameSize, const QSize& showSize);

QtScrcpy/device/ui/toolform.cpp

@@ -20,6 +20,9 @@ ToolForm::ToolForm(QWidget* adsorbWidget, AdsorbPositions adsorbPos)
     m_videoForm = dynamic_cast<VideoForm*>(adsorbWidget);
 
     initStyle();
+
+    // TODO
+    ui->screenShotBtn->hide();
 }
 
 ToolForm::~ToolForm()
@@ -118,9 +121,7 @@ void ToolForm::on_powerBtn_clicked()
 
 void ToolForm::on_screenShotBtn_clicked()
 {
-    if (m_videoForm && m_videoForm->getController()) {
+    // TODO
-        m_videoForm->getController()->screenShot();
-    }
 }
 
 void ToolForm::on_volumeUpBtn_clicked()