Remove unused machineStateChanged signal, fix black status description

Author: etet100

src/gpilot/ui/forms/frmmain.cpp

@@ -3105,11 +3105,6 @@ void FrmMain::updateControlsState(const UiState& state)
         QAbstractItemView::DoubleClicked | QAbstractItemView::SelectedClicked |
         QAbstractItemView::EditKeyPressed | QAbstractItemView::AnyKeyPressed);
 
-    if (!portOpened) {
-        ui->state->setStatusText(tr("Not connected"), "palette(button)", "palette(text)");
-        emit machineStateChanged(-1);
-    }
-
     if (!running) {
         ui->jog->restoreKeyboardControl();
     }

src/gpilot/ui/forms/frmmain.h

@@ -98,7 +98,6 @@ class FrmMain : public QMainWindow
     void responseReceived(QString command, int tableIndex, QString response);
     void statusReceived(QString status);
     void senderStateChanged(int state);
-    void machineStateChanged(int state);
     void settingsAboutToLoad();
     void settingsLoaded();
     void settingsAboutToSave();