优化代码逻辑，修复潜在播放问题

src/common/utils/lyric-font-player/font-player.js

@@ -141,7 +141,7 @@ module.exports = class FontPlayer {
       // lineText += text
 
       if (this.shadowContent) {
-        if (!lrcShadowContent) lrcShadowContent = document.createElement('div')
+        lrcShadowContent ??= document.createElement('div')
         const shadowDom = document.createElement('span')
         shadowDom.textContent = text
         lrcShadowContent.appendChild(shadowDom)

src/common/utils/migrateSetting.ts

@@ -25,7 +25,7 @@ export default (setting: any): Partial<LX.AppSetting> => {
     // 迁移列表滚动位置设置 ~0.18.3
     if (setting.list?.scroll) {
       let scroll = setting.list.scroll
-      if (setting.list.isSaveScrollLocation) setting.list.isSaveScrollLocation = scroll.enable
+      setting.list.isSaveScrollLocation &&= scroll.enable
       delete setting.list.scroll
     }
 

src/common/utils/renderer.ts

@@ -244,7 +244,7 @@ export const scrollXRTo = (element: HTMLElement, to: number, duration = 300, fn
   */
 let dom_title = document.getElementsByTagName('title')[0]
 export const setTitle = (title: string | null) => {
-  if (!title) title = '洛雪音乐助手'
+  title ||= '洛雪音乐助手'
   dom_title.innerText = title
 }