db: Use $fname instead of __METHOD__ magic constant

db: Use $fname instead of __METHOD__ magic constant

The insert() method calls insertOneRow() method on line 391. It then
passes $fname which defaults to __METHOD__ in its function header and
not using $fname instead of __METHOD__ in insertOneRow() method makes
this parameter unused which of course should be used.

Change-Id: Ic5f5ee878e4f919a96900ba88755641ac85929df