remove obsolete CameraConfig

Since 0.7.0, the one in the db package is used both for actual storage
within the database and for API use. I left the API-specific version
around by accident.

server/src/json.rs

@@ -66,14 +66,6 @@ pub struct Camera<'a> {
     pub streams: [Option<Stream<'a>>; 2],
 }
 
-#[derive(Debug, Serialize)]
-#[serde(rename_all = "camelCase")]
-pub struct CameraConfig<'a> {
-    pub onvif_host: &'a str,
-    pub username: Option<&'a str>,
-    pub password: Option<&'a str>,
-}
-
 #[derive(Debug, Serialize)]
 #[serde(rename_all = "camelCase")]
 pub struct Stream<'a> {