LCL, trigger OnSelect when autocomplete changed the current item, fix DbGrid updating values on pressing Up/Down (or ENTER on last column) when AutoComplete is enabled in picklist editor, reported by McClane

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@47185 4005530d-fff6-0310-9dd1-cebe43e6787f