requirements-swh: Remove schemata extra from swh-storage

This extra requirement has been dropped from swh-storage.

requirements-swh-dev.txt

@@ -10,7 +10,7 @@
 ../swh-journal
 ../swh-counters
 ../swh-objstorage[testing]
-../swh-storage[schemata]
+../swh-storage
 ../swh-objstorage-replayer
 ../swh-scheduler
 ../swh-deposit

requirements-swh.txt

@@ -18,7 +18,7 @@ swh.objstorage.replayer
 swh.scanner
 swh.scheduler
 swh.search
-swh.storage[schemata]
+swh.storage
 swh.vault
 swh.web
 swh.web.client