fix: Round money in order/invoice instead of int

[iamareebjamal]

For fossasia/open-event-frontend#5127

Previously, amount was converted to int, so instead of paying 13.45, people paid 13

[codecov]

Codecov Report

Merging #7294 into development will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##           development    #7294   +/-   ##
============================================
  Coverage        63.93%   63.93%           
============================================
  Files              259      259           
  Lines            13043    13043           
============================================
  Hits              8339     8339           
  Misses            4704     4704           

Impacted Files	Coverage Δ
app/api/users.py	29.14% <ø> (ø)
app/api/helpers/payment.py	24.20% <100.00%> (ø)
app/api/helpers/utilities.py	70.93% <100.00%> (+1.05%)	⬆️
app/models/event_invoice.py	93.47% <100.00%> (-0.21%)	⬇️

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[lgtm-com]

This pull request introduces 1 alert when merging 59e3e20 into b92c444 - view on LGTM.com

new alerts:

• 1 for Unused import