Fix Item Name field is not saved to clipboard.

[FedeG]

Across all entry types (credit card, password, note) the Item Name field, when double clicked, is not saved to the clipboard. There is, however, a notification generated that tells the user the field has been 'copied'.

Reproduce

• Create a new 'Note' entry.
• Fill out all fields and save the entry.
• Return to the new Note and double click the 'Item Name'.
• You should see a message saying the label was copied.
• Attempt to paste the content.
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