rawdata: implement `rawdata` for `sqlitestore` too

This is a different store, it needs it declared.

hgext/sqlitestore.py

@@ -549,6 +549,9 b' class sqlitefilestore(object):'
 
         return fulltext
 
+    def rawdata(self, *args, **kwargs):
+        return self.revision(*args, **kwargs)
+
     def read(self, node):
         return storageutil.filtermetadata(self.revision(node))