Editor: Multi-entity saving: Show correct count of entities to be sav…

…ed (WordPress#66482)

The modal was incorrectly displaying the number of different *types* of
entities to be saved. This result was inconsistent with the actual list
of entities rendered underneath and with the "Review _n_ changes" label
on the left-hand sidebar.

packages/editor/src/components/entities-saved-states/index.js

@@ -177,9 +177,9 @@ export function EntitiesSavedStatesExtensible( {
 									_n(
 										'There is <strong>%d site change</strong> waiting to be saved.',
 										'There are <strong>%d site changes</strong> waiting to be saved.',
-										sortedPartitionedSavables.length
+										dirtyEntityRecords.length
 									),
-									sortedPartitionedSavables.length
+									dirtyEntityRecords.length
 								),
 								{ strong: <strong /> }
 						  )