ui: Remove switch HAVE_PROPERTY_BUTTON

The switch HAVE_PROPERTY_BUTTON was required to distinguish obs-studio
>= 27.0.1 or not.
Now, obs-studio 28.0.0 is the minum required version so that the switch
is no longer necessary.

ui/face-tracker-dock.cpp

@@ -204,11 +204,9 @@ FTDock::FTDock(QWidget *parent)
 	mainLayout->addWidget(enableButton);
 	connect(enableButton, &QPushButton::clicked, this, &FTDock::enableButtonClicked);
 
-#ifdef HAVE_PROPERTY_BUTTON
 	propertyButton = new QPushButton(obs_module_text("Properties"), this);
 	mainLayout->addWidget(propertyButton);
 	connect(propertyButton, &QPushButton::clicked, this, &FTDock::propertyButtonClicked);
-#endif
 
 	ftWidget = new FTWidget(data, this);
 	mainLayout->addWidget(ftWidget);
@@ -473,7 +471,6 @@ void FTDock::enableButtonClicked(bool checked)
 	}
 }
 
-#ifdef HAVE_PROPERTY_BUTTON
 void FTDock::propertyButtonClicked(bool checked)
 {
 	UNUSED_PARAMETER(checked);
@@ -493,7 +490,6 @@ void FTDock::propertyButtonClicked(bool checked)
 
 	obs_source_release(target);
 }
-#endif // HAVE_PROPERTY_BUTTON
 
 void FTDock::notrackButtonChanged(int state)
 {

ui/face-tracker-dock.hpp

@@ -9,11 +9,6 @@
 #include <obs.hpp>
 #include <obs-frontend-api.h>
 
-// the necessary APIs are implemented at 27.0.1-107-g5b18faeb4.
-#if LIBOBS_API_VER > MAKE_SEMANTIC_VERSION(27, 0, 1)
-#define HAVE_PROPERTY_BUTTON
-#endif
-
 class FTDock : public QDockWidget {
 	Q_OBJECT
 
@@ -28,9 +23,7 @@ class FTDock : public QDockWidget {
 	class QPushButton *pauseButton;
 	class QPushButton *resetButton;
 	class QPushButton *enableButton;
-#ifdef HAVE_PROPERTY_BUTTON
 	class QPushButton *propertyButton;
-#endif
 	class FTWidget *ftWidget;
 	class QCheckBox *notrackButton;
 
@@ -72,9 +65,7 @@ private slots:
 	void pauseButtonClicked(bool checked);
 	void resetButtonClicked(bool checked);
 	void enableButtonClicked(bool checked);
-#ifdef HAVE_PROPERTY_BUTTON
 	void propertyButtonClicked(bool checked);
-#endif
 	void notrackButtonChanged(int state);
 };