Fix Euro symbol priority on Quick Accent for German and Spanish (#48488)

[maescoder]

Fixes Euro symbol appearing as default on Quick Accent VK_E key for Spanish and German layouts, restoring pre-v0.100.0 behavior.

Summary of the Pull Request

This PR removes the standalone € symbol from the Language.DE (German) character mappings and the ["é", "€"] mapping from Language.SP (Spanish) for the VK_E key in CharacterMappings.cs.

Because Quick Accent aggregates language arrays alphabetically, the German ["€"] array was being aggregated before the Spanish array. This inadvertently caused the € symbol to take priority and become the default character for users mixing Spanish and German, overriding the desired é character. Users who wish to access the Euro symbol globally can still do so by enabling the Currency language group.

PR Checklist

• Closes: Euro symbol appears on Quick Accent after the update 100 #48488

• Communication: I've discussed this with core contributors already. If the work hasn't been agreed, this work might be rejected
• Tests: Added/updated and all pass
• Localization: All end-user-facing strings can be localized
• Dev docs: Added/updated
• New binaries: Added on the required places
  • JSON for signing for new binaries
  • WXS for installer for new binaries and localization folder
  • YML for CI pipeline for new test projects
  • YML for signed pipeline
• Documentation updated: If checked, please file a pull request on our docs repo and link it here: #xxx

Detailed Description of the Pull Request / Additional comments

Before version 0.100.0, pressing e with Spanish and German selected would correctly default to é. The addition of the Euro symbol to specific languages introduced an alphabetical aggregation bug, floating the € to the front of the list for multi-language users. Removing it from these specific Language sets resolves the issue and aligns with the purpose of the distinct Currency (CUR) group.

Validation Steps Performed

• Manual Validation: Verified in CharacterMappings.cs that removing the [LetterKey.VK_E] = ["€"] line from Language.DE and reverting Language.SP's VK_E back to ["é"] ensures that é is restored as the first and primary accent for the e key.