[w3c/selection-api] Set "has scheduled selectionchange event" to true (PR #356)

This field was never set to true and probably missed before scheduling the task.

Fixes #338

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-- Commit Summary --

  * Set "has scheduled selectionchange event" to true

-- File Changes --

    M index.html (3)

-- Patch Links --

https://github.com/w3c/selection-api/pull/356.patch?email_source=notifications&email_token=ACLYVMJVUDZNTK7NUKDII2T4XJPOPA5CNFSNUABEM5UWIORPF5TWS5BNNB2WEL2QOVWGYUTFOF2WK43UF4ZTKNZUHEZTIMJSHCTHEZLBONXW5KTTOVRHGY3SNFRGKZFFMV3GK3TUVZYHEX3QMF2GG2C7MNWGSY3Lhttps://github.com/w3c/selection-api/pull/356.diff?email_source=notifications&email_token=ACLYVMOQPU5YTZZWLFEM2DT4XJPOPA5CNFSNUABEM5UWIORPF5TWS5BNNB2WEL2QOVWGYUTFOF2WK43UF4ZTKNZUHEZTIMJSHCTHEZLBONXW5KTTOVRHGY3SNFRGKZFFMV3GK3TUVVYHEX3ENFTGMX3DNRUWG2Y
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