fix: missing Item Name on Save for Quotation created from Item

[FHenry]

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When create a Quotation from Item dashboard, select a customer and click on Save => Error : missing Item Name and UOM

Explain the details for making this change. What existing problem does the pull request solve?

As all other make method, the Quotation doctype missing his open_form() call

no-docs

Note to reviewer : if merge, please backport to version-15 and version-14