:bug: fixed alpha arrange scope

vue-theme/src/store/modules/artist.js

 
 let seen = 0
 let hasTitle = []
-const storeTitle = letter => {
-    if(hasTitle.includes(letter)) return
-    flatPacked.push({ slug: letter, title: letter, inbetween: true })
-    hasTitle.push(letter)
-}
+
 const _arrangeByAlpha = artistsList => {
     const alphabet = [...'9abcdefghijklmnopqrstuvwxyz']
     const flatPacked = []
+    
+    const storeTitle = letter => {
+        if(hasTitle.includes(letter)) return
+        flatPacked.push({ slug: letter, title: letter, inbetween: true })
+        hasTitle.push(letter)
+    }
+    
     artistsList.forEach((artist, i) => {
         const lastWord = artist.slug.split('-').filter(c => c).pop()
         const firstCharaOfSortWord = artist.sortname ? artist.sortname[0] : 'z'