[REF] partner_second_lastname: clean firstname and lastname2 when partner is a company

[fernandahf]

When you create a partner type individual and update to company, the field lastname is filled-out with the full name but the fields firstname and lastname2 are not cleaned,
it's causing when you update the partner name with a different order, the full name is computed based on the
fields firstname, lastname and lastname2 and it's inconsistent.

This commit is cleaning the fields firstname and lastname2 from the write method.

Fix #1465

[moylop260]

@JordiBForgeFlow @hugho-ad @luistorresm @antespi

Could you review it, please?

[github-actions]

There hasn't been any activity on this pull request in the past 4 months, so it has been marked as stale and it will be closed automatically if no further activity occurs in the next 30 days.
If you want this PR to never become stale, please ask a PSC member to apply the "no stale" label.

[moylop260]

/ocabot merge major

[OCA-git-bot]

What a great day to merge this nice PR. Let's do it!
Prepared branch 14.0-ocabot-merge-pr-1466-by-moylop260-bump-major, awaiting test results.

[OCA-git-bot]

@moylop260 your merge command was aborted due to failed check(s), which you can inspect on this commit of 14.0-ocabot-merge-pr-1466-by-moylop260-bump-major.

After fixing the problem, you can re-issue a merge command. Please refrain from merging manually as it will most probably make the target branch red.

[fernandahf]

FYI

The CI is failing because an error not-related, issue related: #1557

[moylop260]

Hi @sbidoul

Could be it merged manually?

[sbidoul]

Yes, everything works after a manual merge. The wheel will be published overnight.