feat: message info: add database msg ID

We have recently removed it from the normal "message info" dialog
at least on Delta Chat Desktop, so without this one can't easily find
the ID of a particular message,
which is useful for debugging.

src/tools/tools_tests.rs

@@ -41,6 +41,7 @@ async fn test_parse_receive_headers_integration() {
     let raw = include_bytes!("../../test-data/message/mail_with_cc.txt");
     let expected = r"State: Fresh
 
+Database ID: X
 Message-ID: 2dfdbde7@example.org
 
 Hop: From: localhost; By: hq5.merlinux.eu; Date: Sat, 14 Sep 2019 17:00:22 +0000
@@ -50,6 +51,7 @@ Hop: From: hq5.merlinux.eu; By: hq5.merlinux.eu; Date: Sat, 14 Sep 2019 17:00:25
     let raw = include_bytes!("../../test-data/message/encrypted_with_received_headers.eml");
     let expected = "State: Fresh, Encrypted
 
+Database ID: X
 Message-ID: Mr.adQpEwndXLH.LPDdlFVJ7wG@example.net
 
 Hop: From: [127.0.0.1]; By: mail.example.org; Date: Mon, 27 Dec 2021 11:21:21 +0000
@@ -71,7 +73,10 @@ async fn check_parse_receive_headers_integration(raw: &[u8], expected: &str) {
     // received time that depends on the test time which makes it impossible to
     // compare with a static string
     let capped_result = &msg_info[msg_info.find("State").unwrap()..];
-    assert_eq!(expected, capped_result);
+    assert_eq!(
+        expected.replace("\nDatabase ID: X", &format!("\nDatabase ID: {msg_id}")),
+        capped_result
+    );
 }
 
 #[test]