fix(onClickOutside): adjust shouldListen handling timing

[Doctor-wu]

even if the target is falsy, we should care about the ignore options

fix #3465

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Description

• Fix OnClickoutside: the callback was triggered accidentally when the target is undefined #3465 *
• Function: onClickOutside *

In current logic, if the target is falsy when the event trigger, it won't care about the ignore options which make no sense.
This PR change the logic to judge if should ignore at first before any other judgements related with e

Additional context

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🤖 Generated by Copilot at 018e21c

Refactor and optimize the onClickOutside function in packages/core/onClickOutside/index.ts by simplifying and reordering the logic for setting the shouldListen variable.

🤖 Generated by Copilot at 018e21c

• Simplify and optimize the logic for setting shouldListen (link)

[Doctor-wu]

@antfu This is a replacement PR for #3470

[Doctor-wu]

@antfu This is a replacement PR for #3470

I simply changed a branch to send a PR since I need to contribute some new codes based on the origin branch

[Doctor-wu]

Thanks for merge~