Fix server settings (#38477)

In the settings refactor I'd assumed server settings were like project
settings. This is not the case, they are in fact the normal user
settings;
but just read from the server.

Release Notes:

- N/A

crates/settings/src/settings_content.rs

@@ -166,13 +166,6 @@ impl SettingsContent {
     }
 }
 
-#[skip_serializing_none]
-#[derive(Debug, Default, Serialize, Deserialize, JsonSchema, MergeFrom)]
-pub struct ServerSettingsContent {
-    #[serde(flatten)]
-    pub project: ProjectSettingsContent,
-}
-
 #[skip_serializing_none]
 #[derive(Debug, Default, PartialEq, Clone, Serialize, Deserialize, JsonSchema, MergeFrom)]
 pub struct UserSettingsContent {