优化代码逻辑，修复潜在播放问题

src/renderer/views/List/MusicList/components/SearchList.vue

@@ -137,10 +137,10 @@ export default {
     },
     handle_key_mod_down() {
       console.log('handle_key_mod_down')
-      if (!this.isModDown) this.isModDown = true
+      this.isModDown ||= true
     },
     handle_key_mod_up() {
-      if (this.isModDown) this.isModDown = false
+      this.isModDown &&= false
     },
     handle_key_mod_f_down() {
       if (this.visible) this.$refs.dom_input.focus()

src/renderer/views/List/MusicList/useList.js

@@ -10,16 +10,16 @@ const useKeyEvent = ({ handleSelectAllData }) => {
   }
 
   const handle_key_shift_down = () => {
-    if (!keyEvent.isShiftDown) keyEvent.isShiftDown = true
+    keyEvent.isShiftDown ||= true
   }
   const handle_key_shift_up = () => {
-    if (keyEvent.isShiftDown) keyEvent.isShiftDown = false
+    keyEvent.isShiftDown &&= false
   }
   const handle_key_mod_down = () => {
-    if (!keyEvent.isModDown) keyEvent.isModDown = true
+    keyEvent.isModDown ||= true
   }
   const handle_key_mod_up = () => {
-    if (keyEvent.isModDown) keyEvent.isModDown = false
+    keyEvent.isModDown &&= false
   }
   const handle_key_mod_a_down = ({ event }) => {
     if (event.target.tagName == 'INPUT') return