Danny Tuppeny 592c5ba91a
Don't be case-sensitive when checking for extension (#18515)
Seems like VS Code may have started using lowercase extension folders recently (our identifier is `Dart-Code.flutter` but now the folder is named `dart-code.flutter`), so this makes the check not sensitive to casing.

Also reuse extension identifier for download link
2018-06-18 06:37:01 +01:00
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