settings_ui: Fix hover popover delay setting's json_path

[daydalek]

The "Hover Popover → Delay" setting item had its json_path set to "hover_popover_enabled" (copy-paste error from the item above it), introduced in #40739. This caused:

• "Copy Link" generating a wrong zed://settings/hover_popover_enabled URL
• #hover_popover_delay filter returning no results in settings search
• Telemetry reporting delay changes as hover_popover_enabled

The pick/write closures were always correct, so the setting itself functioned normally.

after the fix, filter works correctly

and the copy link button return the correct result

Release Notes:

• Fixed an issue where "Hover Popover Delay" setting could not be searched or linked correctly in the settings UI.

[cla-bot]

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[SomeoneToIgnore]

Thank you!