Remove unnecessary smart pointer in binder

[andyfengHKU]

No description provided.

[codecov]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (c471abe) 93.26% compared to head (b137caa) 93.39%.

Files	Patch %	Lines
src/catalog/catalog_content.cpp	94.44%	1 Missing ⚠️
src/include/binder/bound_comment_on.h	0.00%	1 Missing ⚠️
src/include/binder/bound_statement_visitor.h	90.00%	1 Missing ⚠️
src/include/binder/ddl/bound_drop_table.h	0.00%	1 Missing ⚠️
...ator/persistent/reader/csv/parallel_csv_reader.cpp	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2624      +/-   ##
==========================================
+ Coverage   93.26%   93.39%   +0.13%     
==========================================
  Files        1041     1041              
  Lines       39033    39002      -31     
==========================================
+ Hits        36405    36427      +22     
+ Misses       2628     2575      -53     

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