Fix parsing TOML key 'position' and values (#281)

* fix parsing toml key position and values

* Using rename_all instead rename over each enum

* rename struct field directly

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Co-authored-by: Ferdinand Schober <ferdinand.schober@fau.de>

lan-mouse-ipc/src/lib.rs

@@ -59,6 +59,7 @@ pub enum IpcError {
 pub const DEFAULT_PORT: u16 = 4242;
 
 #[derive(Debug, Default, Eq, Hash, PartialEq, Clone, Copy, Serialize, Deserialize)]
+#[serde(rename_all = "lowercase")]
 pub enum Position {
     #[default]
     Left,