Update merchant rules subtitle copy

[MelvinBot]

Description

Remove "the" from the merchant rules subtitle copy on the Workspace Rules page.

Current copy: "Set the merchant rules so expenses arrive correctly coded and require less cleanup."
New copy: "Set merchant rules so expenses arrive correctly coded and require less cleanup."

Location: src/languages/en.ts — translation key workspace.rules.merchantRules.subtitle

This change needs to be applied across all supported language files.

Slack thread: https://expensify.slack.com/archives/D0AM4G91P6U/p1773348513716139

[MelvinBot]

🤖 Draft PR created: #86974

Changed "Set the merchant rules..." → "Set merchant rules..." in src/languages/en.ts.

Please mark it as "Ready for review" when it is ready for review.