Fix imports

src/main/java/ch/hepia/ui/MainWindowController.java

@@ -26,11 +26,9 @@ import javafx.scene.paint.CycleMethod;
 import javafx.scene.paint.LinearGradient;
 import javafx.scene.paint.Stop;
 import javafx.util.Duration;
-import org.json.JSONArray;
 
 import java.io.IOException;
 import java.net.URL;
-import java.text.ParseException;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.ResourceBundle;