fix(vite): fix inspector short key failure

[wzc520pyfm]

hi~, I am working on #547 , but I found vite-plugin-vue-inspector's toggleComboKey was set to '', this makes the default shortcut key for opening the inspector invalid.
When I removed it, vite-plugin-vue-inspector's toggleComboKey is working!

After this pr, I plan to add this default shortcut key for inspector to the documentation, as well as how to customize the option of vite-plugin-vue-inspector.

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[alexzhang1030]

Probably users can configure the combo key by passing some options like the docs say.

[wzc520pyfm]

Probably users can configure the combo key by passing some options like the docs say.

I agree, users can customize shortcuts by passing a config, but perhaps we should provide default shortcuts as well?

[alexzhang1030]

How about implementing the user-defined toggle combo key in this PR?

[wzc520pyfm]

How about implementing the user-defined toggle combo key in this PR?

I wrote the custom shortcut documentation in #559. The user can do this by passing Options.componentInspector.toggleComboKey to vuedevtoolnext.