Pressing the left button during "Hold to confirm" action in wallet backup flow breaks the action

[obrusvit]

Describe the bug When confirming wallet backup words with a "Hold to confirm" action on the right button, a user might press the left button with "up" symbol (^) to disrupt the animation and show the words again on TS3.

Firmware version and revision Release 24/03 T2B1 (TS3)

To Reproduce Steps to reproduce the behavior:

1. Create a new wallet
2. scroll through all the words
3. while doing "Hold to confirm", press a left button

Expected behavior Left button ^ should be disabled while "Hold to confirm" is in progress.

Additional context Bug reported on Slack here with a video: https://satoshilabs.slack.com/archives/CL1D61PQF/p1714826059311779

Note: Check that this behavior doesn't occur elsewhere.