[4.0][com_banners] fix Undefined variable: db when sticky

[alikon]

Summary of Changes

fix PHP Notice: Undefined variable: db in administrator/components/com_banners/Table/BannerTable.php on line 324

Testing Instructions

create a banner
set it pinned unpinned
check error log

Expected result

no notice

Actual result

notice

[Quy]

I have tested this item ✅ successfully on 4b1ffab

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[richard67]

I have tested this item ✅ successfully on 4b1ffab

It took a while until I noticed you meant pin/unpin in the list view and not in the edit view ;-)

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[Quy]

RTC

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[wilsonge]

Thanks!