Two more fields kept text across openings. The log viewer's search box and
the filter it drives both outlived a close, so the modal reopened already
filtered; opening it now clears both. The playlist manager's Move to
folder menu reset its query but not the box, which QbzLineEdit re-seeds
only while unfocused; it now resets the box too.
The remaining text fields in modals, popups and menus were checked and
already reset on open (genre filter, playlist picker, disc metadata,
replacement search, DAC wizard, sidebar row menu) or are read-only.
cc