Tails Installer sometimes installs files without confirmation

If not self.live.existing_live_os, Tails Installer in “Clone and Upgrade” mode tries to copy a new liveos without confirmation. The good news is that, in this case, it does not delete existing files on the target partition, so no file loss should occur.

Presumably removing the if on line 717 in gui.py should fix this.

Related issues

Related to #6438 (closed)

Original created by @alant on 6437 (Redmine)

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