test(e2e): hand the serve test's share to the daemon, not the run

The serving process built its arguments by hand, so in daemon mode
--shared-dir stayed on the attached run, where shares belong to the
daemon and the flag is ignored. The daemon fell back to sharing its
default folder - which on a developer machine contains the probe files
earlier buggy runs deposited, so the test only passed by finding
served.bin in leftovers. args_with routes the share to the process
whose session does the sharing in either mode.

soulseek-rs/tests/cli_e2e.rs

@@ -2124,18 +2124,17 @@ fn serve_stays_online_and_reports_an_upload_a_peer_pulls() {
     std::fs::write(share.path().join("served.bin"), probe_bytes())
         .expect("share file");
 
-    // A serving process: online, sharing, streaming upload records.
-    let mut args = server.args("cli_e2e_server");
+    // A serving process: online, sharing, streaming upload records. The share
+    // is a session flag: in daemon mode it must reach the daemon, whose
+    // session does the sharing — handed to the run itself it would be
+    // silently ignored and the daemon would serve its default folder.
+    let mut args = server.args_with(
+        "cli_e2e_server",
+        &["--shared-dir".to_string(), share.display()],
+    );
     args.retain(|arg| arg != "--quiet");
     args.extend(
-        [
-            "--shared-dir",
-            &share.display(),
-            "--json",
-            "serve",
-            "--duration",
-            "25",
-        ]
+        ["--json", "serve", "--duration", "25"]
             .iter()
             .map(|a| (*a).to_string()),
     );