Fix: Type error in requestFromUrl

When using `requestFromUrl()` in #29026 we noticed errors being thrown
from within `waitForData()`. Investigation revealed this basic type
error that could have been caught by a language and compiler before it
was pushed to production. Yay JS.

This wasn't detected because this function isn't yet being used and we
weren't sure how to test it. Thankfully our fail-fast methodology
prevented this from appearing to our customers.

client/state/data-getters/index.js

@@ -38,7 +38,7 @@ import { dummyTaxRate } from 'lib/tax'; // #tax-on-checkout-placeholder
  */
 export const requestFromUrl = url =>
 	requestHttpData( `get-at-url-${ url }`, rawHttp( { method: 'GET', url } ), {
-		fromApi: () => data => [ `get-at-url-${ url }`, data ],
+		fromApi: () => data => [ [ `get-at-url-${ url }`, data ] ],
 	} );
 
 export const requestActivityActionTypeCounts = (