docs(payments): correct open_url_direct toggle hint to match real behavior (#654272)

The hint claimed the provider opens 'inside the MiniApp/tab' — that is the broken behavior that caused #654272 (a same-WebView navigation to the provider can't hand off to a bank app / SBP). After the fix the link opens in the EXTERNAL browser inside Telegram regardless of the toggle. Rewrote the hint in all four locales: ON = open immediately (no button panel), OFF = show an 'Open payment' button; both open externally in Telegram so bank-app/SBP payments work; Stars/CryptoBot (t.me/ links) always open natively and ignore the flag.

Note: the external-browser open is unconditional (both toggle states, all methods incl. WATA) — the toggle only controls auto-open vs a button tap.

src/locales/en.json

@@ -1596,7 +1596,7 @@
       "methodEnabled": "Method enabled",
       "providerNotConfigured": "Provider not configured in env",
       "openUrlDirect": "Open payment page directly",
-      "openUrlDirectHint": "Skip the link panel: the provider opens inside the MiniApp/tab right after the click. After payment the user returns to /balance/top-up/result. Ignored for Stars/CryptoBot and other t.me/ links.",
+      "openUrlDirectHint": "ON — the payment link opens immediately, without the intermediate button panel. OFF — an \"Open payment\" button is shown. Inside Telegram the link opens in the external browser either way (otherwise paying via a bank app/SBP fails); after payment the user returns to the result page. Stars/CryptoBot (t.me/ links) always open natively and ignore this flag.",
       "displayName": "Display name",
       "displayNameHint": "Leave empty for default name",
       "subOptions": "Payment options",