simplify CustomPicker and fix ios18 runtime error

This fixes a reflection runtime error for our custom picker

Fixes: https://github.com/damus-io/damus/issues/2332
Signed-off-by: William Casarin <jb55@jb55.com>

damus/Views/DirectMessagesView.swift

@@ -72,13 +72,11 @@ struct DirectMessagesView: View {
     
     var body: some View {
         VStack(spacing: 0) {
-            CustomPicker(selection: $dm_type, content: {
-                Text("DMs", comment: "Picker option for DM selector for seeing only DMs that have been responded to. DM is the English abbreviation for Direct Message.")
-                    .tag(DMType.friend)
-                Text("Requests", comment: "Picker option for DM selector for seeing only message requests (DMs that someone else sent the user which has not been responded to yet). DM is the English abbreviation for Direct Message.")
-                    .tag(DMType.rando)
-            })
-            
+            CustomPicker(tabs: [
+                ("DMs", DMType.friend),
+                ("Requests", DMType.rando),
+            ], selection: $dm_type)
+
             Divider()
                 .frame(height: 1)