[pgAdmin4][RM#4138] Allow us to set the dropdown body when rendering Select2 control

[Murtuza Zabuawala]

Hi,

PFA minor patch to fix the issue where Select2 dropdown position
incorrectly in some cases.
Ref: https://select2.org/troubleshooting/common-problems

Please review.

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

RM_4138.diff
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