[w3c/IndexedDB] Adjust how the direction is defaulted in "Creating a request to retrieve multiple items" (PR #478)

Since [getAllKeys](https://w3c.github.io/IndexedDB/#dom-idbobjectstore-getallkeys) takes an `any` parameter, we cant be sure that the object we get is of the type `IDBGetAllOptions`. As such, there is no default values applied to the object passed in.

If the object passed then doesnt contain direction, we will try to call `retrieve_multiple_items_from_an_XXX` with an undefined value for `direction.` I assume this is not the intention, and as such this PR aims to set the default value of `"next"` in those cases.

The same would apply to `query` and `count`, but those are explicitly handled to return an unbounded key, and infinite results in other places.

The following tasks have been completed:

 * [x] Confirmed there are no ReSpec/BikeShed errors or warnings.
 * [ ] Modified Web platform tests (link to pull request)

Implementation commitment:

 * [ ] WebKit (https://bugs.webkit.org/show_bug.cgi?id=)
 * [ ] Chromium (https://bugs.chromium.org/p/chromium/issues/detail?id=)
 * [ ] Gecko (https://bugzilla.mozilla.org/show_bug.cgi?id=)


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You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/IndexedDB/pull/478

-- Commit Summary --

  * Adjust how the direction is defaulted in "Creating a request to retrieve multiple items"

-- File Changes --

    M index.bs (4)

-- Patch Links --

https://github.com/w3c/IndexedDB/pull/478.patch
https://github.com/w3c/IndexedDB/pull/478.diff

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