Change 'gateway' to 'GATEWAY' in main.rs

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: natedemoss

crates/openshell-cli/src/main.rs

@@ -4572,7 +4572,7 @@ mod tests {
             "logs",
             "sb",
             "--source",
-            "gateway",
+            "GATEWAY",
             "--source",
             "sandbox",
         ])