Fixed casing of DecryptCommand class

[hostep]

Magerun pull-request check-list:

• Pull request against develop branch (if not, just close and create a new one against it)
• README.md reflects changes (if any)
• phar fuctional test (in tests/phar-test.sh)

Summary: (some words as summary)

Fixed a typo in the class name

Changes proposed in this pull request:

Fixed typo, so composer's optimised autoloader no longer complains:

$ composer dump-autoload -o
Generating optimized autoload files
Class N98\Magento\Command\Developer\decryptCommand located in ./src/N98/Magento/Command/Developer/DecryptCommand.php does not comply with psr-4 autoloading standard (rule: N98\ => ./src/N98). Skipping.
...

[github-actions]

Download the artifacts for this pull request:

• n98-magerun2.phar.zip

[cmuench]

@hostep thx