hide signature in "Saved messages"

"Saved messages" would show the "Self" signature,
while that may be okay if the chat would be named "Self chat" or so,
for "Saved messages", this is a bit weird.
if we want a preview, we should add that somewhere else,
it is not expected here.

deltachat-ios/ViewModel/ContactDetailViewModel.swift

@@ -57,9 +57,11 @@ class ContactDetailViewModel {
 
         sections.append(.chatOptions)
 
-        let dcContact = DcContact(id: contactId)
-        if !dcContact.status.isEmpty {
-            sections.append(.statusArea)
+        if !self.isSavedMessages {
+            let dcContact = DcContact(id: contactId)
+            if !dcContact.status.isEmpty {
+                sections.append(.statusArea)
+            }
         }
 
         if sharedChats.length > 0 && !isSavedMessages && !isDeviceTalk {