small fix for EvaluableExprVisitor

[czpmango]

What type of PR is this?

• bug
• feature
• enhancement

What does this PR do?

Fix EvaluableExprVisitor::visitBinaryExpr.

Additional context:

That is same as FindAnyNonEvaluableLeafExpr.
Can the implementation of EvaluableExprVisitor be unified to FindVisitor?

Checklist：

• Documentation affected （Please add the label if documentation needs to be modified.)
• Incompatible （If it is incompatible, please describe it and add corresponding label.）
• Need to cherry-pick （If need to cherry-pick to some branches, please label the destination version(s).)
• Performance impacted: Consumes more CPU/Memory

Release notes：

No need to change.

[codecov-commenter]

Codecov Report

Merging #3389 (fe914a8) into master (fe68b0e) will decrease coverage by 0.02%.
The diff coverage is 86.95%.

@@            Coverage Diff             @@
##           master    #3389      +/-   ##
==========================================
- Coverage   85.27%   85.25%   -0.03%     
==========================================
  Files        1276     1277       +1     
  Lines      118999   119093      +94     
==========================================
+ Hits       101475   101527      +52     
- Misses      17524    17566      +42     

Impacted Files	Coverage Δ
src/clients/meta/MetaClient.h	95.65% <ø> (ø)
src/kvstore/NebulaStore.h	95.23% <ø> (ø)
src/kvstore/PartManager.h	97.14% <ø> (ø)
src/graph/session/GraphSessionManager.cpp	80.79% <33.33%> (-0.82%)	⬇️
src/common/expression/ContainerExpression.cpp	90.00% <66.66%> (-2.13%)	⬇️
src/common/utils/MetaKeyUtils.cpp	81.02% <74.19%> (-0.30%)	⬇️
src/kvstore/PartManager.cpp	55.26% <80.00%> (+1.13%)	⬆️
src/graph/executor/admin/ConfigExecutor.cpp	93.84% <90.90%> (-0.70%)	⬇️
src/clients/meta/MetaClient.cpp	75.71% <100.00%> (-0.33%)	⬇️
src/graph/service/GraphFlags.cpp	100.00% <100.00%> (ø)
... and 40 more

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[Shylock-Hg]

Please add test case.

[czpmango]

Please add test case.

ACK.