Add privacy-based redaction to nsec in key settings view

Changelog-Changed: Added privacy-based redaction to nsec in key settings view
Signed-off-by: Terry Yiu <git@tyiu.xyz>

damus/Views/Settings/KeySettingsView.swift

@@ -89,6 +89,7 @@ struct KeySettingsView: View {
                                 .disabled(true)
                         } else {
                             Text(sec)
+                                .privacySensitive()
                                 .clipShape(RoundedRectangle(cornerRadius: 5))
                         }