ui: fix bracket mode end code typo

Thanks to Gert Hulselmans for noticing in 35c3017419

ui/src/terminal.rs

@@ -103,7 +103,7 @@ derive_csi_sequence!(
 
 derive_csi_sequence!(
     #[doc = "Empty struct with a Display implementation that returns the byte sequence to end [Bracketed Paste Mode](http://www.xfree86.org/current/ctlseqs.html#Bracketed%20Paste%20Mode)"]
-    (BracketModeEnd, "?2003l")
+    (BracketModeEnd, "?2004l")
 );
 
 pub const BRACKET_PASTE_START: &[u8] = b"\x1B[200~";