fix: Payment Terms not fetched in Purchase Invoice from Purchase Receipt

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Issue:

• Create PO and PR against it
• Now create a Purchase Invoice against this Purchase Receipt, the Payment Terms Template is fetched but the Terms are not fetched from the Template
• This occurs due to the incorrect order of events.
• From PR to PI, PI's onload is called via the doc mapper, at this time it gets no Payment Terms Template. Thus, it adds a row for Payment terms with invoice portion 100%
• After this, Template is fetched and set from client side, but since table is populated, it does nothing
  

Fix:

• Set the Template while mapping the doc so that during onload it will fetch the correct Terms
• Renamed get_pyt_term_template => get_payment_terms_template
  

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@Mergifyio backport version-12-hotfix

[mergify]

Command backport version-12-hotfix: pending

Waiting for the pull request to get merged

[mergify]

Command backport version-12-hotfix: failure

No backport have been created

• Backport to branch version-12-hotfix failed
  backport fail: repository is too big and no subscription is active