ios: pass the online search rows' placeholder icons as images, as ProfileImage now takes them

Master changed ProfileImage's iconName: String to icon: Image (#7767's merge brought it in). The Directory and Names rows and New chat's group row still passed iconName, which no longer compiles; they pass Image(systemName:) as master's own callers do.

apps/ios/Shared/Views/ChatList/DirectorySearchView.swift

@@ -238,7 +238,7 @@ struct DirectorySearchRow: View {
         HStack(spacing: 8) {
             ProfileImage(
                 imageStr: entry.image,
-                iconName: isChannel ? "antenna.radiowaves.left.and.right.circle.fill" : "person.2.circle.fill",
+                icon: Image(systemName: isChannel ? "antenna.radiowaves.left.and.right.circle.fill" : "person.2.circle.fill"),
                 size: 42
             )
             VStack(alignment: .leading, spacing: 2) {
@@ -289,7 +289,7 @@ struct NameSearchRow: View {
 
     var body: some View {
         HStack(spacing: 8) {
-            ProfileImage(imageStr: result.image, iconName: result.iconName, size: 42)
+            ProfileImage(imageStr: result.image, icon: Image(systemName: result.iconName), size: 42)
             VStack(alignment: .leading, spacing: 2) {
                 if let profileName = result.profileName {
                     (Text(profileName).fontWeight(.bold) + Text(verbatim: " (\(result.simplexName))").foregroundColor(theme.colors.secondary))

apps/ios/Shared/Views/Contacts/ContactListNavLink.swift

@@ -174,7 +174,7 @@ struct ContactListNavLink: View {
             }
         } label: {
             chatPreview(
-                ProfileImage(imageStr: groupInfo.image, iconName: groupInfo.chatIconName, size: 30),
+                ProfileImage(imageStr: groupInfo.image, icon: Image(systemName: groupInfo.chatIconName), size: 30),
                 NameWithBadge(Text(chat.chatInfo.chatViewName).foregroundColor(theme.colors.onBackground), chat.chatInfo.nameBadge)
                     .lineLimit(1)
             )