[NT-1495] Update logic for quantity attributed text in RewardCardView

[singhhari]

📲 What

When specifying a quantity of add-ons, we use # x add-on name on both the Pledge screen and the View/Manage Pledge screen. On the Pledge screen, we hide # x when # is > 1, but we don’t do that on the View/Manage screen

🤔 Why

Consistency within view controllers that display similar information.

🛠 How

All of the work is done in the RewardCardViewModel. We're doing a check on the quantity of the add-on which was updated.

[codecov]

Codecov Report

Merging #1308 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1308   +/-   ##
=======================================
  Coverage   85.70%   85.70%           
=======================================
  Files        1109     1109           
  Lines       96870    96882   +12     
=======================================
+ Hits        83022    83035   +13     
+ Misses      13848    13847    -1     

Impacted Files	Coverage Δ
Library/ViewModels/RewardCardViewModel.swift	95.23% <100.00%> (+0.59%)	⬆️
Library/ViewModels/RewardCardViewModelTests.swift	100.00% <100.00%> (ø)

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[justinswart]

Ok, looks good - can we add a test to be sure? 🙂