[pgAdmin4][RM#2989] To fix the issue in Table node

[Murtuza Zabuawala]

Hi,

PFA patch to fix the issue in Table node where wrong sql was generated
while altering column.

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

RM_2989.diff
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fix_table_node_PEP8.diff
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