Change currency picker style to navigation link

Sources/SatsPrice/ContentView.swift

@@ -39,6 +39,7 @@ public struct ContentView: View {
     }
 
     public var body: some View {
+        NavigationStack {
             Form {
                 Section {
                     Picker("Price Source", selection: $priceSource) {
@@ -56,6 +57,7 @@ public struct ContentView: View {
                             }
                         }
                     }
+                    .pickerStyle(.navigationLink)
 
                     HStack {
                         TextField("", text: $satsViewModel.btcToCurrencyString)
@@ -137,6 +139,7 @@ public struct ContentView: View {
 #endif
         }
     }
+}
 
 #Preview {
 #if DEBUG