[Backport] Wrong invoice prefix in multistore setup due to default stor…

[gelanivishal]

Original Pull Request

#15332

Set correct store id for Invoice

Description

I have taken correct store id from store object.

Fixed Issues (if relevant)

1. Wrong invoice prefix in multistore setup due to default store id #14063: Wrong invoice prefix in multistore setup due to default store id
2. ...

Manual testing scenarios

1. Create Multiple Store View
2. Place an order from different store view and create an invoice
3. Check Invoice prefix for different store view

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[sanjay-wagento]

I will create request