API call uses instruments not instrument (#391)

Author: stephen-riggs

src/murfey/client/__init__.py

@@ -289,7 +289,7 @@ def run():
     status_bar = StatusBar()
 
     machine_data = requests.get(
-        f"{murfey_url.geturl()}/instrument/{instrument_name}/machine"
+        f"{murfey_url.geturl()}/instruments/{instrument_name}/machine"
     ).json()
     gain_ref: Path | None = None