Since NXS-5424, previously saved searches with columns with complex data -> choice of columns not respected

This issue has been introduced via NXS-5424.

• To understand, you will need to go back in time before NXS-5424 was implemented and then save a custom search form with a custom choice of displayed columns displaying data from complex values. Observe that the saved search works great.
• Once done, get back to present, and update your project with its current version (which includes NXS-5424),and observe the saved search now fails in that the columns are the default ones for the custsom search, not the chosen ones
• change in the table CVD_SELECTEDLAYOUTCOLUMNS the names in the ITEM columns from the format "a/b" to the format "a_b", and then the saved search will again display the saved columns

Even if Studio should not have generated row names with /, it has, and now it’s persisted on the DB level, so we need to handle that at the platform level to avoid any data migration.