Fix the background image validation

[Roshyo]

No description provided.

[codecov]

Codecov Report

Merging #183 (cae52a2) into 0.12.x (a8dd0c4) will increase coverage by 1.49%.
The diff coverage is 100.00%.

❗ Current head cae52a2 differs from pull request most recent head 338d9aa. Consider uploading reports for the commit 338d9aa to get more accurate results

@@             Coverage Diff              @@
##             0.12.x     #183      +/-   ##
============================================
+ Coverage     38.57%   40.06%   +1.49%     
- Complexity      454      455       +1     
============================================
  Files            88       88              
  Lines          1470     1470              
============================================
+ Hits            567      589      +22     
+ Misses          903      881      -22     

Impacted Files	Coverage Δ
...idator/Constraints/HasBackgroundImageValidator.php	81.81% <100.00%> (+81.81%)	⬆️
src/Model/GiftCardConfiguration.php	66.66% <0.00%> (+21.66%)	⬆️

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