Change defaults for gift card layout

[loevgaard]

This will change the default orientation to landscape and the paper size to A6. I reckon this makes more sense for most users :)

[codecov]

Codecov Report

Merging #227 (6098a3d) into 0.12.x (2b0069e) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 6098a3d differs from pull request most recent head e2a89f3. Consider uploading reports for the commit e2a89f3 to get more accurate results

@@            Coverage Diff            @@
##             0.12.x     #227   +/-   ##
=========================================
  Coverage     49.53%   49.53%           
  Complexity      534      534           
=========================================
  Files           103      103           
  Lines          1716     1716           
=========================================
  Hits            850      850           
  Misses          866      866           

Impacted Files	Coverage Δ
src/DependencyInjection/Configuration.php	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 2b0069e...e2a89f3. Read the comment docs.