Invoices: Bug fixes

We Squashed Some Bugs!
Bug
: When payment schedules and partial payments are involved with the combination of tips , sometimes the payment fails due to a calculation issue
Solution:
 Fixed! Now irrespective of the combination payments should flow in smoothly ! 
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Bug:
 For a invoice, where adding a product on the fly it picked up product name instead of the price name in invoice lineItem!
Solution
: Fixed! Now we have added appropriate guardrails in order to prevent this issue 
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Bug
: Earlier we had restricted the email configuration's length for en email to 40 characters in the UI which caused issues for some client  !
Solution
: Fixed! This limit is now enhanced and client's won't face this issue anymore !