Accordion dropdown data attribute misspelled

[jameswilson]

In v3-next branch, there is a new feature to collapse sidebar dropdowns, but it is misspelled:

data-drodpown-accordion="true"

should be :

data-dropdown-accordion="true"

This is a follow-up issue for #502

[xidedix]

@jameswilson thanks for the catch!

[mrholek]

@jameswilson will be solved in the next release.

[stale]

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