Fix to #1027 to allow SnapshotVersion == 0 (#1033)

Author: rsgowman

packages/firestore/src/local/query_data.ts

@@ -70,8 +70,12 @@ 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
+        : overwrite.resumeToken
     );
   }