COMMON: beamline new get_jfjoch_url helper correction to match legacy code

src/aare/common/beamline.py

@@ -28,4 +28,4 @@ def get_jfjoch_url(bl: MXBeamline) -> str:
         case MXBeamline.X06SA:
             raise NotImplementedError("X06SA beamline not supported yet")
         case _:
-            raise ValueError(f"No JFJoch URL configured for beamline: {bl}")
+            raise ValueError(f"unknown beamline {bl}")