fix(examples): update the get started examples

examples/get_started/lv_example_get_started_1.c

@@ -10,21 +10,23 @@ static void btn_event_cb(lv_obj_t * btn, lv_event_t event)
         /*Get the first child of the button which is the label and change its text*/
         lv_obj_t * label = lv_obj_get_child(btn, 0);
         lv_label_set_text_fmt(label, "Button: %d", cnt);
+        lv_obj_align(label, NULL, LV_ALIGN_CENTER, 0, 0);
     }
 }
 
 /**
- * Create a button with a label and react on Click event.
+ * Create a button with a label and react on click event.
  */
 void lv_example_get_started_1(void)
 {
     lv_obj_t * btn = lv_btn_create(lv_scr_act(), NULL);     /*Add a button the current screen*/
     lv_obj_set_pos(btn, 10, 10);                            /*Set its position*/
     lv_obj_set_size(btn, 120, 50);                          /*Set its size*/
-    lv_obj_add_event_cb(btn, btn_event_cb, NULL);                 /*Assign a callback to the button*/
+    lv_obj_add_event_cb(btn, btn_event_cb, NULL);           /*Assign a callback to the button*/
 
     lv_obj_t * label = lv_label_create(btn, NULL);          /*Add a label to the button*/
     lv_label_set_text(label, "Button");                     /*Set the labels text*/
+    lv_obj_align(label, NULL, LV_ALIGN_CENTER, 0, 0);
 }
 
 #endif