Restore dblclick zoom on add-way behavior

[aditya1010-max]

Description

This PR addresses the issue described in #11373
behaviorAddWay disables double-click zoom when the behavior is installed, but restores it only through a delayed timer in the cancel path. If the mode exits before the timer fires (for example when cancelling quickly or switching modes), the cleanup may not run and double-click zoom can remain disabled.

Fix

Restore double-click zoom synchronously in behavior.off() so that the cleanup runs whenever the behavior is removed.
This ensures double-click zoom is consistently restored on all exit paths, including:

• finishing a way
• cancelling the operation
• switching modes

Result

Double-click zoom is reliably restored after leaving Add Way mode.

This was verified by finishing a way, cancelling the operation, and switching modes to ensure zoom behavior is restored consistently (see clip below).

Fixes

Fixes #11373

Clips

Before

before.mp4

After

after3.mp4

[aditya1010-max]

@tyrasd I’ve updated the PR description with more details and added short clips demonstrating the issue and the fix.

Would appreciate it if you could take a look whenever you have time.