[pgAdmin][RM7388] Error message will fill the entire window if the query is long

[Aditya Toshniwal]

Hi Hackers,

Attached patch fixes the issue.
Please review.

-- 
Thanks,
Aditya Toshniwal
pgAdmin Hacker | Software Architect | *edbpostgres.com*
<http://edbpostgres.com>
"Don't Complain about Heat, Plant a TREE"

RM7388.patch
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