[FIX] sale_order_type: Fix item search in account move view

[stevTresCloud]

• In case there is a modification of the view, with studio or a custom development by adding a new tab before the main invoice lines tab, an error occurs with this search because it doesn't find the item in the xpath expression. With this modification, we ensure that the item to search for is in the main invoice lines tab.

[celm1990]

It can be more specific and simplified to avoid ambiguity, as follows:

Suggested change

	<xpath
	expr="//notebook//page[@id='invoice_tab']//list//field[@name='sequence']"
	position="before"
	>
	<xpath
	expr="//field[@name='invoice_line_ids']//list//field[@name='sequence']"
	position="before"
	>

I think this field might be unnecessary according to this PR: odoo/odoo#137031. The fields used in other fields/attributes are automatically added as invisible.

@pedrobaeza @StefanRijnhart What do you think?

[pedrobaeza]

Yeah, that seems so, so you can remove it directly.