nozaps: switch to global sheet when zapping

This fixes many popping bugs

Changelog-Fixed: Fix zap sheet popping

damus/Models/HomeModel.swift

@@ -52,6 +52,7 @@ class HomeModel {
     var notifications = NotificationsModel()
     var notification_status = NotificationStatusModel()
     var events: EventHolder = EventHolder()
+    var zap_button: ZapButtonModel = ZapButtonModel()
     
     init() {
         self.damus_state = DamusState.empty

damus/Models/ZapButtonModel.swift

@@ -10,6 +10,4 @@ import Foundation
 class ZapButtonModel: ObservableObject {
     var invoice: String? = nil
     @Published var zapping: String = ""
-    @Published var showing_select_wallet: Bool = false
-    @Published var showing_zap_customizer: Bool = false
 }

damus/Models/Zaps/CustomizeZapModel.swift

@@ -15,7 +15,6 @@ class CustomizeZapModel: ObservableObject {
     @Published var zap_type: ZapType = .pub
     @Published var invoice: String = ""
     @Published var error: String? = nil
-    @Published var showing_wallet_selector: Bool = false
     @Published var zapping: Bool = false
     @Published var show_zap_types: Bool = false