Revert "Ensure %w and %# are also expaned in the 'Copy input' dialog"

That fix is not good enough because it makes '%w' being updated only
after keystroke instead of immediately . The issue of updating title is
actually a little more complicated than I have understood.

Revert it because the regression should influence more users than the
fixed problem does. Need to spend more time to find a better fix.

CCBUG: 175755
CCBUG: 287536

This reverts commit 1c198150.