Set "Direct only" to false as default

For android, it is set to true, as multihop is not supported.

Note that in the daemon, the setting is called
`use_multihop_if_necessary` and has the inverse meaning.

mullvad-types/src/wireguard.rs

@@ -81,14 +81,28 @@ impl FromStr for QuantumResistantState {
 pub struct QuantumResistantStateParseError;
 
 #[cfg(daita)]
-#[derive(Debug, Default, Clone, Serialize, Deserialize, PartialEq)]
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
 pub struct DaitaSettings {
     pub enabled: bool,
 
     #[serde(default)]
+    /// Whether to use multihop if the selected relay is not DAITA-compatible. Note that this is
+    /// the inverse of of "Direct only" in the GUI.
     pub use_multihop_if_necessary: bool,
 }
 
+#[cfg(daita)]
+impl Default for DaitaSettings {
+    fn default() -> Self {
+        Self {
+            enabled: false,
+            // This setting should be enabled by default, expect on Android where multihop is not
+            // supported.
+            use_multihop_if_necessary: cfg!(not(target_os = "android")),
+        }
+    }
+}
+
 /// Contains account specific wireguard data
 #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, Eq)]
 pub struct WireguardData {