Apply avatar style to local account avatar images

Tusker/Screens/Preferences/LocalAccountAvatarView.swift

@@ -10,19 +10,27 @@ import SwiftUI
 
 struct LocalAccountAvatarView: View {
     let localAccountInfo: LocalData.UserAccountInfo
-    @State
-    var avatarImage: UIImage? = nil
+    @State var avatarImage: UIImage? = nil
+    @ObservedObject var preferences = Preferences.shared
     
     var body: some View {
         let image: Image
         if avatarImage == nil {
-            image = Image(systemName: "person.crop.square")
+            let imageName: String
+            switch preferences.avatarStyle {
+            case .circle:
+                imageName = "person.crop.circle"
+            case .roundRect:
+                imageName = "person.crop.square"
+            }
+            image = Image(systemName: imageName).resizable()
         } else {
             image = Image(uiImage: self.avatarImage!).renderingMode(.original)
         }
         return image
             .resizable()
             .frame(width: 30, height: 30)
+            .cornerRadius(preferences.avatarStyle.cornerRadiusFraction * 30)
             .onAppear(perform: self.loadImage)
     }