Issue in fg_color and bg_color for connection string on query tool.

[Nikhil Mohite]

Hi Team,

I have fixed the issue of fg_color and bg_color of the connection string
for the query tool.
PFA patch. (This is related to RM-3794
<https://redmine.postgresql.org/issues/3794>)

-- 
*Thanks & Regards,*
*Nikhil Mohite*
*Software Engineer.*
*EDB Postgres* <https://www.enterprisedb.com/>
*Mob.No: +91-7798364578.*

connection_fg_and_bg_color_issue.patch
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