[pgAdmin][Patch] Highlight adjacent switch cell on focus in backgrid(IE11)

[Ganesh Jaybhay]

Hi Hackers,

Attached is the minor fix to highlight adjacent switch cell on focus in
IE11.

Currently nn create table columns tab, on navigating from Not Null? to
Primary key? column, switch cell for primary key doesn't get highlighted.

Kindly review.

Regards,
Ganesh Jaybhay

adjacent_switch_focus.patch
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