YSQL: Fix Index Read Requests in colocated bitmap scan tests

Summary:
D39453/2578d8b6422d6c6e015b30b01520ea27bcf6b87e made a fix to reduce the number of read requests in an query with a LIMIT on colocated tables. It missed updating the output file
for yb_bitmap_scans_colo. This test fixes that issue.

Test Plan: Jenkins: test regex: .*PgRegressYbBitmapScans.*

Reviewers: telgersma

Reviewed By: telgersma

Subscribers: yql

Differential Revision: https://phorge.dev.yugabyte.com/D39735

src/postgres/src/test/regress/expected/yb_bitmap_scans_colo.out

@@ -1004,7 +1004,7 @@ SELECT * FROM test_limit WHERE a < 200 LIMIT 10;
          ->  Bitmap Index Scan on test_limit_a_idx (actual rows=199 loops=1)
                Index Cond: (a < 200)
                Storage Table Rows Scanned: 199
-               Storage Index Read Requests: 20
+               Storage Index Read Requests: 3
                Storage Index Rows Scanned: 199
 (9 rows)