Set LeftButton color from screen (#810)

android/app/src/main/java/com/reactnativenavigation/screens/Screen.java

 
     public void setTitleBarLeftButton(String navigatorEventId, LeftButtonOnClickListener backButtonListener,
                                       TitleBarLeftButtonParams titleBarLeftButtonParams) {
+        titleBarLeftButtonParams.setColorFromScreenStyle(styleParams.titleBarButtonColor);
         topBar.setTitleBarLeftButton(navigatorEventId,
                 backButtonListener,
                 titleBarLeftButtonParams,