fix(enter-amount): assign the secondary currency-button flag

`SwapAmountView.init` took `showSecondaryCurrencyButton` and dropped it on the
floor, so the stored property kept its `false` default no matter what a caller
passed. `DualSwapAmountView` hands it `!isCurrencySelectorHidden`, which meant
the chevron beside the converted value was hidden in every dual-swap view and
`onSecondaryCurrencyTap` could never fire.

Lost in 971ce13, where `secondaryErrorMessage` was threaded through the same
init and this line went with it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: Roman

Sources/DashUIKit/Components/EnterAmount/SwapAmountView.swift

@@ -86,6 +86,7 @@ public struct SwapAmountView: View {
         self.onPaste = onPaste
         self.secondarySymbol = secondarySymbol
         self.showSecondaryDashLogo = showSecondaryDashLogo
+        self.showSecondaryCurrencyButton = showSecondaryCurrencyButton
         self.secondaryErrorMessage = secondaryErrorMessage
         self.onSecondaryCurrencyTap = onSecondaryCurrencyTap
         self.swapAnimationKey = swapAnimationKey