[pgAdmin4][RM#3495] Do not check for binary content if BOM marker is present in the file

[Murtuza Zabuawala]

Hi,

PFA patch to fix the issue where the user was not able to load the file in
the Query tool which contains the BOM marker, The sample file with BOM
marker is already attached in the RM.


--
Regards,
Murtuza Zabuawala
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

RM_3495.diff
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