Update vexflow.d.ts (#9095)
Update vexflow.d.ts (#9095)

* Update vexflow.d.ts

Backends renderer enum starts with 1, according to http://www.vexflow.com/docs/renderer.html

* Update vexflow.d.ts

fix all enums

* Update vexflow.d.ts

fix StaveConnector 'type' enum. "SINGLE_LEFT and SINGLE are the same value for compatibility with older versions of vexflow"

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