fix: Validate LCV for Invoices without Update Stock

[marination]

Issue:

• While adding a Receipt Document in the Purchase Receipts table, a condition applied on the field is that if the document is a Purchase Invoice only suggest those that have Update Stock enabled.
• However if you manually add one without Update Stock enabled, it allows to Save and Submit
• Now if this Invoice has stock items in it, even though Update Stock is disabled, it creates SLEs for the line items to recalculate valuation
• LCVs must be created against transactions that have stock impact only

Fix:

[coveralls]

Coverage increased (+0.01%) to 42.87% when pulling 9817303 on marination:lcv-validate-invoice-develop into 6949114 on frappe:develop.