Fix variable name

common/http-api-client/src/user_agent.rs

@@ -10,6 +10,7 @@ use nym_bin_common::build_information::{BinaryBuildInformation, BinaryBuildInfor
 pub struct UserAgent {
     pub application: String,
     pub version: String,
+    pub system: Option<String>,
     pub platform: String,
     pub git_commit: String,
 }
@@ -17,10 +18,11 @@ pub struct UserAgent {
 impl fmt::Display for UserAgent {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         let abbreviated_commit = self.git_commit.chars().take(7).collect::<String>();
+        let system = self.system.clone().unwrap_or_else(|| "unknown".to_string());
         write!(
             f,
-            "{}/{}/{}/{}",
-            self.application, self.version, self.platform, abbreviated_commit
+            "{}/{}/{}/{}/{}",
+            self.application, self.version, system, self.platform, abbreviated_commit
         )
     }
 }
@@ -38,6 +40,7 @@ impl From<BinaryBuildInformation> for UserAgent {
         UserAgent {
             application: build_info.binary_name.to_string(),
             version: build_info.build_version.to_string(),
+            system: None,
             platform: build_info.cargo_triple.to_string(),
             git_commit: build_info.commit_sha.to_string(),
         }
@@ -49,6 +52,7 @@ impl From<BinaryBuildInformationOwned> for UserAgent {
         UserAgent {
             application: build_info.binary_name,
             version: build_info.build_version,
+            system: None,
             platform: build_info.cargo_triple,
             git_commit: build_info.commit_sha,
         }