qt: Allow text of all labels to be selected with the mouse
* qt/pinentrydialog.cpp (PinEntryDialog::PinEntryDialog): Set text interaction flags of all text labels to TextSelectableByMouse. (PinEntryDialog::accessibilityActiveChanged): Keep ClickFocus in focus policy of labels.
This is not needed for accessibility (as far as I know), but it helps
with support if users are able to copy the text of labels.
- GnuPG-bug-id: T5863