calibre: Update post_install script

Author: SorYoshino

bucket/calibre.json

@@ -46,7 +46,7 @@
     },
     "post_install": [
         "$calibre_path = (Join-Path -Path $dir -ChildPath 'Calibre') -replace '\\\\', '\\\\'",
-        "Get-ChildItem -Path \"$bucketsdir\\extras\\scripts\\$app\" -Filter '*.reg' -File | ForEach-Object {",
+        "Get-ChildItem -Path \"$bucketsdir\\$bucket\\scripts\\$app\" -Filter '*.reg' -File | ForEach-Object {",
         "    $content = Get-Content -Path $_.FullName -Encoding utf8",
         "    if ($_.Name -ne 'unregister-file-associations.reg' `",
         "            -and $global) { $content = $content -replace 'HKEY_CURRENT_USER', 'HKEY_LOCAL_MACHINE' }",