fix: avatar monogram needs to use compat mode

Author: wmontwe

feature/account/avatar/impl/src/main/kotlin/net/thunderbird/feature/account/avatar/ui/CompatAccountAvatar.kt

@@ -17,7 +17,9 @@ fun rememberCompatAvatar(
     name: String,
 ): Avatar = remember(avatar, name) {
     when (avatar) {
-        is Avatar.Monogram -> avatar
+        is Avatar.Monogram -> Avatar.Monogram(
+            value = extractNameInitials(name),
+        )
         is Avatar.Icon -> avatar
         else -> Avatar.Monogram(
             value = extractNameInitials(name),