Update icon in exploration editor breadcrumb

[thesujai]

Fixes #2688:Update icon in exploration editor breadcrumb

Technical details

In routes/DataExplorerRoute.svelte the AppendBreadcrumb component with Edit label was having icon component set to iconExploration. So when we were fetching the icon for the edit component with item.icon we were getting the exploration icon.
Changing the icon component to iconEdit(by importing from @mathesar/icons), we can expect the desired behavior.

Screenshots
Before:

After:

Checklist

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[thesujai]

@rajatvijay i mistakely closed #2692.
please review this one