Fix typo in WALReplayer::replayRelTableRecord

[gaurav8297]

This won't lead to a bug because when we set WalRecord.relTableRecord to some value, then WalRecord.nodeTableRecord will also return the same value since they both store "int" at the same address due to union datatype (WalRecord). However, it's still incorrect from a code perspective.

For example:

struct TestUnion
{
    enum{CHAR, INT} tag;
    union
    {
        int a;
        int b;
    };
};

TEST {
    TestUnion t;
    t.tag = TestUnion::CHAR;
    t.a = 4;
    printf("%d", t.b); // returns 4 because same type as "a" and at that address 4 is stored.
}

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (cb437d7) 91.66% compared to head (b7eed75) 91.66%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1636   +/-   ##
=======================================
  Coverage   91.66%   91.66%           
=======================================
  Files         716      716           
  Lines       26042    26042           
=======================================
  Hits        23871    23871           
  Misses       2171     2171           

Impacted Files	Coverage Δ
src/storage/wal_replayer.cpp	95.01% <100.00%> (ø)

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.