Style updates: whiter button border, app_kb no border

lv_app/lv_app_util/lv_app_kb.c

@@ -84,7 +84,7 @@ void lv_app_kb_init(void)
     kb_btnms.rects.round = 0;
     kb_btnms.rects.bwidth = 0;
 
-   // kb_btnms.btns.rects.bwidth = 0;
+    kb_btnms.btns.rects.bwidth = 0;
     kb_btnms.btns.rects.round = 0;
 }
 

lv_objx/lv_btn.c

@@ -425,7 +425,7 @@ static void lv_btns_init(void)
 	/*Default style*/
     lv_btns_def.mcolor[LV_BTN_STATE_REL] = COLOR_MAKE(0x60, 0x88, 0xb0);
     lv_btns_def.gcolor[LV_BTN_STATE_REL] = COLOR_MAKE(0x20, 0x30, 0x40);
-	lv_btns_def.bcolor[LV_BTN_STATE_REL] = COLOR_MAKE(0xa0, 0xc0, 0xe0);
+	lv_btns_def.bcolor[LV_BTN_STATE_REL] = COLOR_MAKE(0xff, 0xff, 0xff);
 	lv_btns_def.lcolor[LV_BTN_STATE_REL] = COLOR_MAKE(0x30, 0x40, 0x50);
 	lv_btns_def.flags[LV_BTN_STATE_REL].light_en = 0;
 	lv_btns_def.flags[LV_BTN_STATE_REL].transp = 0;