removed unused variable

src/Utils/DataAccess/LuStoredProcedure.php

@@ -18,7 +18,6 @@ abstract class LuStoredProcedure
 {
     protected static $_connection = "mydb";
     protected static $_storedProcedure = "mydb_table";
-    protected static $_dboClass = LuDbo::class;
     protected static $_dboArrayClass = LuDbo::class;
 
     /**