[fix] Fix objectsCount in UserDefaultsStore

[omaralbeik]

[fix] Fix a bug where objectsCount in UserDefaultsStore was increased even if store already has the object

[codecov]

Codecov Report

Merging #13 into master will increase coverage by 0.28%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #13      +/-   ##
==========================================
+ Coverage   89.06%   89.35%   +0.28%     
==========================================
  Files          13       13              
  Lines         558      573      +15     
==========================================
+ Hits          497      512      +15     
  Misses         61       61

Impacted Files	Coverage Δ
Sources/UserDefaults/SingleUserDefaultsStore.swift	100% <ø> (ø)	⬆️
Sources/Files/FilesStore.swift	98.36% <ø> (ø)	⬆️
Sources/Files/SingleFileStore.swift	93.61% <ø> (ø)	⬆️
Sources/Keychain/SingleKeychainStore.swift	0% <ø> (ø)	⬆️
Tests/UserDefaults/UserDefaultsStoreTests.swift	100% <100%> (ø)	⬆️
Sources/UserDefaults/UserDefaultsStore.swift	100% <100%> (ø)	⬆️

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