Fix to #1027 to allow SnapshotVersion == 0

Author: rsgowman

packages/firestore/src/local/query_data.ts

@@ -70,8 +70,8 @@ export class QueryData {
       this.query,
       this.targetId,
       this.purpose,
-      overwrite.snapshotVersion || this.snapshotVersion,
-      overwrite.resumeToken || this.resumeToken
+      overwrite.snapshotVersion === undefined ? this.snapshotVersion : overwrite.snapshotVersion,
+      overwrite.resumeToken === undefined ? this.resumeToken : overwwrite.resumeToken
     );
   }