eventsmodel: remove inheritence in Reactions/Reposts model

Simplify with new EventsModel constructors. This is slightly less
typesafe but its not a big deal, I hate inheritence more.

Signed-off-by: William Casarin <jb55@jb55.com>

damus/Views/ReactionsView.swift

@@ -9,8 +9,8 @@ import SwiftUI
 
 struct ReactionsView: View {
     let damus_state: DamusState
-    @StateObject var model: ReactionsModel
-    
+    @StateObject var model: EventsModel
+
     @Environment(\.dismiss) var dismiss
     
     var body: some View {
@@ -38,6 +38,6 @@ struct ReactionsView: View {
 struct ReactionsView_Previews: PreviewProvider {
     static var previews: some View {
         let state = test_damus_state
-        ReactionsView(damus_state: state, model: ReactionsModel(state: state, target: test_note.id))
+        ReactionsView(damus_state: state, model: .likes(state: state, target: test_note.id))
     }
 }